2 March 2026 09:26
Topic starter
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After a trip on truffles, I often have a very hard time falling asleep. Why is that, and what can I do to sleep better?
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2 March 2026 10:05
It is a recognizable phenomenon: the trip is over, your body feels tired, but your brain remains active. This is not a psychological coincidence, but a direct result of the pharmacodynamics of psilocin and the way serotonergic and glutamatergic systems regulate sleep. You are not simply “too awake.” Your brain is temporarily in a heightened learning and integration mode in which rest is not the biological priority.
The 5-HT2A receptor as an on-switch
Psilocin is a partial agonist with high affinity for the 5-HT2A receptor. This means that this receptor is not only occupied but continues to actively transmit signals. Activation of 5-HT2A increases neuronal excitability in the cortex and indirectly suppresses the ventrolateral preoptic nucleus in the hypothalamus, the area that normally functions as a sleep switch. This nucleus releases GABA to inhibit the arousal system. When 5-HT2A remains active, that inhibition becomes less powerful, and the brain remains in a state of heightened alertness.
It is important to note that it is not just about receptor occupancy. The half-life of psilocin is relatively short, but even when the concentration drops, the neural network temporarily remains in a state of heightened excitation. The system must restabilize itself. That is why you can be physically exhausted but unable to find mental rest.
The glutamate cascade and cortical arousal
The 5-HT2A receptors are located primarily on pyramidal cells in the prefrontal cortex. When these are activated, there is a strong increase in glutamate release. Glutamate is the most important excitatory neurotransmitter in the central nervous system and plays a crucial role in learning processes and neuroplasticity. During the comedown, this means that the cerebral cortex remains in a high-energy state.
Research shows that REM latency is prolonged after psilocybin and that slow-wave activity in the first sleep cycle may be reduced. This means that it takes longer for the dream phase to begin and that deep restorative sleep is temporarily less vigorous. Serotonergic activation suppresses REM sleep, which is fully consistent with this pharmacological profile. Simultaneously, the brain is engaged in synaptic reconfiguration. The plasticity that is therapeutically valuable translates neurophysiologically into activity and processing. The brain is in learning mode, not resting mode.
The melatonin paradox
It is often thought that insomnia after a trip is related to melatonin, but there is no direct blockade of melatonin receptors. Psilocin does not bind to MT1 or MT2 receptors. Therefore, the sleep hormone is not directly blocked. Melatonin is normally synthesized from serotonin in the pineal gland when it gets dark. Although psilocin is structurally similar to serotonin, the body cannot convert it into melatonin.
What is at play here is functional dominance. The stimulating glutamate signal is simply stronger than the subtle melatonin signal. The problem is not a melatonin deficiency, but the overriding of the sleep signal by cortical activation.
Default Mode Network and reintegration
During a psilocybin experience, the Default Mode Network is temporarily disrupted. This network is involved in self-reference, autobiographical thinking, and internal narratives. After the trip, this network must restabilize. That process consumes energy and requires network reorganization. Subjectively, this can feel like a brain that is still operating without clear direction. This internal activity makes the transition to deep sleep more difficult.
Temperature as a biological sleep signal
To initiate sleep, core temperature must drop by approximately one to one and a half degrees. This is an essential signal for the hypothalamus to start sleep. Under the influence of psilocybin, the sympathetic nervous system is often still active, causing heat to be retained longer in the body's core.
Paradoxically, a short warm shower can help. Warm water causes vasodilation, opening up the blood vessels in the skin and extremities. When you step out of the shower afterward, you quickly lose heat through the skin, and your core temperature drops more efficiently. This sends a powerful physiological signal that it is time to sleep. A cool bedroom, ideally around sixteen to eighteen degrees, further supports this process.
Spoiler
More about cooling down
To fall asleep, your core temperature needs to drop by approximately 1°C to 1.5°C. This signal is essential for the hypothalamus (the control center in your brain) to initiate the production of endogenous melatonin and to dampen activity in the cerebral cortex. However, under the influence of psilocybin, your body is in a state of heightened sympathetic activity. This often keeps the blood vessels in your extremities (hands and feet) narrower, trapping heat in your core.
Paradoxically, the best way to cool down is by taking a short warm shower or bath (not ice-cold!). Vasodilation: Warm water causes the blood vessels in your skin, hands, and feet to dilate. Heat release: As soon as you step out of the shower, your skin acts as a massive radiator. The blood cools rapidly in the air and flows back to your core. Result: Your core temperature drops, which is a powerful biological signal to your brain that it is time to sleep. This can compensate just enough for the "noise" of 5-HT2A activation.
The ideal bedroom temperature after a trip is lower than normal, around 16°C to 18°C. A cool room helps to dissipate the heat your body produces due to increased glutamate activity more quickly. Temperature is one of the few external factors strong enough to override the neuronal stimuli of the comedown.
Breathing and vagal activation
After a trip, the sympathetic system is often still dominant. To reverse this, the parasympathetic system must be activated, and the key to doing so lies in exhalation. During exhalation, the vagus nerve activates the release of acetylcholine, which immediately lowers the heart rate and moves the body towards a state of rest.
Techniques such as the so-called physiological sigh, in which you inhale briefly twice and then exhale slowly, can quickly reduce tension. The 4-7-8 method emphasizes a long exhalation and a short breath hold, which forces the nervous system to slow down. Resonant breathing, with an even rhythm of approximately five to six breaths per minute, can bring heart rate variability into coherence and dampen cortical arousal. In all cases, prolonging the exhalation is the crucial factor.
Spoiler
Breathing explanation
To calm the "chemical storm" of psilocin and glutamate, you need to activate the Vagus nerve (the 10th cranial nerve). This nerve is the master switch of your parasympathetic nervous system: the "rest and recovery mode." When you lie in bed after a trip, your sympathetic system (fight-or-flight) is still dominant. Breathing is the only function of the autonomic nervous system over which you have direct conscious control to "hack" this system. Here are the three most effective techniques:
1. The "Physiological Sigh" According to neuroscientist Andrew Huberman, this is the fastest way to lower your stress level and heart rate. It helps to fully reopen the alveoli (air sacs) that have collapsed due to shallow "trip breathing," and to efficiently expel CO2. How: Breathe deeply in through your nose. When you think you are full, take an extra short puff of air (a double inhalation). Then exhale very slowly and completely through your mouth (as if blowing through a straw). Why it works: The second inhalation forces the alveoli open, causing the subsequent long exhalation to maximally stimulate the Vagus nerve.
2. The 4-7-8 Technique (The "Natural Calming") This technique is specifically designed for falling asleep. It forces your brain to focus on a rhythm, which helps to suppress the "noise" of the Default Mode Network (DMN). The Rhythm: Inhale through the nose for 4 seconds. Hold your breath for 7 seconds (this increases the CO2 pressure in the blood, which has a calming effect on the brain). Exhale forcefully through the mouth for 8 seconds with a "woosh" sound. Focus: The focus here is on the 8-second exhalation. A long exhalation slows the heart rate directly via sinus arrhythmia.
3. Resonant or Coherent Breathing This is less "directive" and pleasant if you find the 4-7-8 technique too intense during a lingering trip. The goal is to reach a rhythm of approximately 5.5 breaths per minute. How: Breathe in for 5.5 seconds and breathe out for 5.5 seconds. The mechanism: This brings your heart rate variability (HRV) into a state of "coherence." Your heart and brain begin to work in a synchronous rhythm, which dampens cortical arousal (that glutamate noise we talked about).
Why exhalation is the key Physiologically, this is what happens: When you inhale, your diaphragm is pushed down and your heart has less room. The blood flows faster, and your brain signals your heart rate to increase. When you exhale, there is more room for the heart. The vagus nerve immediately signals (via acetylcholine) to lower the heart rate. By making your exhalation twice as long as your inhalation, you constantly give your brain the command: "We are safe, you can go to sleep.""
Supplements as support
Supplements are not an antidote, but in some cases they can help to slightly reduce arousal. GABA can induce subjective relaxation at approximately one gram sublingually, although its central action is limited by its moderate passage across the blood-brain barrier. CBD in a dosage of approximately twenty-five to fifty milligrams can have a calming effect through modulation of 5-HT1A receptors and reduction of neuronal excitation, but the response is individual and interactions with medication are possible.
Magnesium, for example in the form of bisglycinate or threonate, is particularly interesting because it acts as a natural blocker of the NMDA receptor, a subtype of the glutamate receptor. In doing so, it directly intervenes in the glutamate-driven irritability that contributes to insomnia. However, supplements should not be combined with benzodiazepines, antipsychotics, or strong sleep medication without consulting a doctor, and CBD can affect liver enzymes.
Conclusion
You may have trouble sleeping after psilocybin because 5-HT2A receptors are activated, a glutamate cascade causes cortical arousal, REM and deep sleep are temporarily suppressed, and the melatonin signal is functionally overridden while the Default Mode Network is still stabilizing. This is not a psychological failure, but a temporary physiological state.
The key is not to fight insomnia, but to create the right conditions. Lower your temperature, prolong your exhalation, minimize stimuli, and give the system time. Sleep does not need to be chased. When the neurochemistry normalizes, rest follows naturally.
See also: General sleep tips
