on October 29, 2026
Insights from Traditional Chinese Medicine
Anxiolytic, antispasmodic, and hypnotic properties are the main activities traditionally attributed to Passionflower and Valerian in phytotherapy. Yet, considering them simply as two sedative plants would mean missing one of the most interesting perspectives offered by Traditional Chinese Medicine (TCM): although the two remedies may converge toward a common goal—promoting calm and sleep—they are described in terms of different natures and energetic dynamics.
In Chinese pharmacology, every remedy possesses one or more “natures”, specific qualities through which the plant is interpreted for its ability to dynamically influence the body: it can help decrease or increase, slow down or speed up certain functional activities. It is therefore not a matter of classifying a plant simply as “sedative,” but of understanding in which state of the body its use is most appropriate.
This is a particularly interesting perspective when discussing insomnia. After all, not all sleep difficulties arise from the same underlying cause: in some cases, tension, irritability, hyper-excitability, and difficulty switching off the mind predominate; in others, fatigue, exhaustion, loss of energy, and a state of psycho-physical fragility emerge. TCM allows us to understand these differences through energetic categories that attribute complementary characteristics to the two plants.
Passionflower: calming the Shen when excess predominates
According to the TCM energetic interpretation reported in the phytotherapeutic tradition, Passionflower is a plant of cool nature, associated with the ability to calm the Shen, the “vital spirit,” and to reduce excess Yang in the Liver meridian.
This characteristic makes it particularly interesting in the model of insomnia associated with a state of hyperactivation. When the body seems unable to slow down, the mind continues to process thoughts, emotions become more reactive, and even mild stimuli can trigger disproportionate responses.
From the TCM perspective, this pattern can be attributed to an excess of Liver Yang, associated with manifestations such as anger, irritability, agitation, and difficulty finding the state of calm necessary to drift off to sleep.
Hyperactivation may also be accompanied by somatic symptoms: muscle tension, muscle spasms, and tension headaches, as well as palpitations and hyper-excitability. Body and mind are therefore not considered separately: difficulty sleeping may be the expression of a body that continues to maintain a high level of activation even when it should enter the nighttime recovery phase.
In this sense, Passionflower represents, within the proposed energetic framework, the remedy associated with the need to cool, calm, and restore balance to a system characterized by excess.
It is a valuable plant when the problem is not simply “not being sleepy,” but being unable to let go and fall asleep: when emotional tension, irritability, reactivity, and mental activation seem to keep the body in a state of vigilance.
Valerian: supporting the “empty” terrain
Valerian introduces a seemingly surprising perspective: although traditionally considered a plant with a sedative effect, in the TCM energetic interpretation it is described as a plant of warm/hot nature, therefore capable of “warming.”
Its profile is therefore different from that of Passionflower.
Valerian is associated with conditions in which insomnia or anxiety arise not so much from an excess of energy, but from a “void”, a loss of resources, and a progressive depletion of psycho-physical strength.
It is the terrain of fatigue, asthenia, and exhaustion, mental weariness, and that state in which prolonged stress seems to have depleted the body’s ability to recover.
In the described tradition, Valerian can help tonify the Heart Yin and Yang, which in TCM is considered the system connected to mental and spiritual activities and to the regulation of blood flow and cardiac pumping. From this perspective, it is associated with conditions characterized by mental fatigue, exhaustion, fear, night sweats, memory lapses, and depressive states, as well as forms of insomnia linked to energy loss.
The difference from Passionflower therefore becomes particularly significant: Passionflower is understood in the context of excess and hyperactivation; Valerian in that of void and exhaustion.
This distinction allows us to move beyond the simplistic idea that all insomnia is the same and requires a sedative.
Two complementary natures for understanding sleep
It is precisely this complementarity that makes the combination of the two phytocomplexes interesting.
On the one hand, there is the body that cannot slow down: the mind remains active, emotions are reactive, muscles are tense, and sleep is hindered by a persistent state of vigilance.
On the other hand, there is the fatigued and exhausted body, in which difficulty sleeping may be part of a pattern of depleted energy and reduced recovery capacity.
From the TCM perspective, Passionflower and Valerian therefore do not simply represent two substances with an additive sedative effect. They represent two different ways of supporting the body toward balance, acting on energetic configurations described as different but potentially complementary.
Their synergy can therefore be interpreted as a broader strategy: calming excess without weighing the body down and supporting void without merely sedating.
This approach introduces a central concept of personalized medicine: the value of a remedy depends not only on its intrinsic activity, but also on the consistency between the remedy’s profile and the person’s functional terrain.
In this sense, TCM offers a perspective that can complement—without replacing—phytotherapeutic assessment and contemporary biomedical research. The categories of “nature,” “excess,” “void,” Yin, Yang, and Shen belong to the theoretical model of traditional Chinese medicine and should not be confused with diagnoses or pathophysiological mechanisms in modern medicine. Their value in the context of integrative phytotherapy lies primarily in the ability to understand individual complexity and distinguish between different presentations of the same disorder.
And it is precisely from this distinction that the rationale for the combination arises: not only to promote sleep, but to create the conditions for sleep that is more balanced, continuous, and truly restorative.
Sleeping is not enough: it is important to sleep well
Sleep is not simply a break from daily activity. It is an active biological state during which the brain profoundly alters its functioning and activates processes essential for maintaining neuronal homeostasis.
For this reason, when discussing natural sleep remedies, the goal should not merely be to promote falling asleep, but to help create the physiological conditions for truly restorative rest.
Passionflower and valerian represent two of the most interesting phytocomplexes in this area. Both possess relaxing and sedative properties, but they differ in their phytochemical composition and mechanisms of action.
And it is precisely this difference that makes their combination interesting.
Two plants, two profiles, one possible synergy
Valeriana officinalis acts through a complex phytocomplex in which valerenic acid and other components have been studied primarily in relation to the modulation of the GABAergic system, one of the main inhibitory systems of the central nervous system.
Passiflora incarnata, on the other hand, contains flavonoids and other bioactive compounds studied for their ability to modulate neurochemical systems involved in relaxation and the reduction of neuronal excitability.
The point of interest is therefore not simply to add two sedative plants together.
The combination allows for different phytocomplexes to be used together, acting on partially complementary biological processes.
This constitutes the rationale for the synergy: while valerian is particularly studied for the modulation of neuroinhibitory systems and relaxation, passionflower has a particularly interesting profile in the context of stress, agitation, and nervous hyperactivation.
Phytotherapeutic documentation highlights how the two plants can be considered in terms of different characteristics: passionflower is traditionally associated with irritability, tension, and hyper-excitability, while valerian is more commonly associated with nervous tension and psycho-physical fatigue.
Why the combination may be more interesting than a single plant
When two phytocomplexes have complementary mechanisms, their combination can theoretically produce a broader effect than the isolated use of each component.
This concept of phytotherapeutic synergy is particularly interesting in the context of sleep because insomnia does not necessarily depend on a single mechanism.
A person may simultaneously experience:
· mental hyperactivation;
· stress;
· muscle tension;
· difficulty falling asleep;
· nighttime awakenings;
· difficulty achieving sufficiently deep sleep.
Acting on more than one of these mechanisms simultaneously can therefore have a stronger rationale than seeking a single “sedative” molecule.
This does not mean that the combination is automatically more effective in everyone. It means that the complementarity of the phytocomplexes provides a biological rationale for a more comprehensive effect, which must be verified by specific clinical studies on the combination and its appropriate dosage.
The available clinical evidence shows that both passionflower and certain valerian preparations can have beneficial effects on aspects of sleep, but studies on the individual plants cannot automatically be used to demonstrate the effectiveness of any combination.
Passionflower: reducing hyperactivation
Passionflower is particularly interesting when sleep difficulties are accompanied by stress, agitation, and difficulty switching off the mind.
The plant’s flavonoids have been studied for their interactions with receptor systems involved in inhibitory neurotransmission. The phytocomplex therefore has a profile consistent with a relaxing and anxiolytic effect.
A randomized, double-blind, placebo-controlled clinical study conducted on people with stress and sleep difficulties found that after 30 days of treatment with an extract of Passionflower, there was a reduction in perceived stress and an increase in total sleep time compared to the placebo.
Previous clinical studies had also observed subjective improvements in sleep quality after taking passionflower.
Valerian: promoting neurophysiological relaxation
Valerian has a particularly complex phytocomplex containing sesquiterpenes, valerenic acid, valerenic acid derivatives, valerenone, lignans, and flavonoids.
The GABAergic system is one of the main targets studied.
The physiological consequence most relevant to sleep is the potential to promote a reduction in neuronal excitability and a state of greater relaxation.
However, in this case too, it is not correct to attribute the plant’s effect to a single molecule: its activity is the result of the interaction of numerous components of the phytocomplex.
Clinical evidence on valerian is overall more heterogeneous than its long history of use might suggest. A recent review of systematic reviews highlighted inconclusive results on insomnia, although it suggested a possible improvement in the subjective perception of sleep quality.
This reinforces an important concept: the quality of the extract, the preparation used, the dosage, and the person’s profile are all determining factors.
The true strength of synergy: acting on the pathway to sleep
The Passionflower-Valerian combination can be interpreted as an intervention at multiple levels.
Passionflower helps modulate excitability and the stress response; valerian helps promote neurophysiological relaxation.
Together, the two phytocomplexes can therefore create conditions that are favorable not only for falling asleep, but also for maintaining a neurophysiological environment conducive to more regular sleep.
This is the central point of synergy: not simply “sedating,” but promoting the transition from active wakefulness to a physiological state of rest.
The desired result is sleep that is not only quicker to enter but also more continuous and restorative.
Deep sleep and brain “cleaning”
The quality of sleep becomes even more important when considering what happens in the brain during rest.
During sleep, particularly during deep NREM stages, processes related to the circulation of cerebrospinal fluid and the exchange between extracellular fluid and perivascular compartments increase.
These phenomena are at the basis of the glymphatic system model, a transport network that helps distribute cerebrospinal fluid and remove metabolites and waste products from nervous tissue.
In popular terms, it can be described as a genuine “physiological brain cleansing,” provided it is clarified that this is not detoxification in the commercial sense of the term.
The brain continuously produces metabolites and proteins that must be removed. Sleep promotes the physiological processes through which these products are transferred and subsequently eliminated.
Among the molecules studied in this context are beta-amyloid and tau. The most recent evidence continues to indicate a relationship between sleep, cerebrospinal fluid dynamics, and brain clearance, while emphasizing that direct measurement of these processes in humans remains complex.
Restorative sleep is therefore also biologically active sleep
Contemporary research is gradually moving beyond the idea of sleep as a mere period of inactivity.
During deep sleep, the following processes occur:
neuronal recovery → metabolic regulation → neuroendocrine modulation → memory consolidation → maintenance of brain homeostasis → metabolite clearance.
The glymphatic system is one of the mechanisms through which the brain can promote the removal of substances accumulated during wakefulness.
For this reason, fragmented or insufficient sleep should not be assessed solely in terms of “hours slept”: sleep quality and architecture are also biologically important.
From sedation to physiological sleep
This is the difference between simply looking for something that “makes you sleep” and building an approach focused on physiological, restorative sleep.
The goal should not be to achieve simple sedation, but to create conditions in which the body can properly go through the different stages of sleep.
Research on the glymphatic system suggests that sleep structure, and in particular the physiology of NREM sleep, is important for brain clearance processes. Recent studies indicate that noradrenergic and vascular oscillations during NREM sleep are closely associated with cerebrospinal fluid movement and glymphatic clearance.
For this reason, the concept of restorative sleep takes on a much broader meaning than simply “sleeping for eight hours.”
Synergy as a principle of personalized medicine
Modern phytotherapy can recover an ancient principle: there is not necessarily a universal remedy, because insomnia is not the same for everyone.
The combination of passionflower and valerian becomes particularly interesting when you want to work simultaneously on the stress component, nervous hyperactivity, and difficulty relaxing.
The synergy of the two phytocomplexes can offer a more comprehensive action compared to choosing a single plant, but the actual clinical superiority of the combination compared to individual administrations must be demonstrated by randomized studies specifically designed to compare these treatments.
This distinction is important because it allows us to keep together phytotherapeutic tradition, biological plausibility, and scientific evidence, without turning a rationale of synergy into an as-yet unproven clinical certainty.
From sleep to brain health
The real goal, therefore, is not simply to fall asleep sooner.
It is to create the conditions for continuous, physiological, and restorative sleep, during which the brain can perform its recovery and homeostasis maintenance functions.
Passionflower and valerian, thanks to the complementarity of their respective phytocomplexes, represent an interesting combination in this perspective: one works mainly on the ground of agitation and stress, the other on neurophysiological relaxation.
The possible synergy between the two remedies can therefore be seen as a way to guide the nervous system toward a state more favorable to sleep, while deep sleep, in turn, constitutes the biological context in which important recovery and brain clearance processes are activated.
Sleeping well does not simply mean turning off the brain. It means allowing it to perform some of its most important functions during the night.
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Bibliographic references
1. Randomized, Double-Blind, Placebo-Controlled, Clinical Study of Passiflora incarnata in Participants With Stress and Sleep Problems. 2024.
2. Lee J, Jung HY, Lee SI, Choi JH, Kim SG. Effects of Passiflora incarnata Linnaeus on polysomnographic sleep parameters in subjects with insomnia disorder: a double-blind randomized placebo-controlled study. Int Clin Psychopharmacol. 2020;35(1):29-35.
3. Does valerian work for insomnia? An umbrella review of the evidence. Eur Neuropsychopharmacol. 2024.
4. Sleep, cerebrospinal fluid, and the glymphatic system: A systematic review. 2022.
5. Physiology of Glymphatic Solute Transport and Waste Clearance from the Brain. J Biol Chem. 2022.
6. Norepinephrine-mediated slow vasomotion drives glymphatic clearance during sleep. 2025.
7. Is glymphatic clearance the secret to restorative sleep? 2026.
PLEASE NOTE: the information provided is for informational and educational purposes only and does not constitute medical advice, a diagnosis, or a prescription. Phytotherapy does not replace the assessment of the causes of insomnia or any prescribed therapies. In the presence of persistent sleep disorders, medical conditions, pregnancy or breastfeeding, or the intake of sedative medications or other therapies, it is advisable to consult a healthcare professional.
