Why does time seem to slow down on a psychedelic?

The exact reasons are still being studied, but this research shows the effect is real and measurable. Psilocybin acts on the serotonin system, which appears to play a part in how the brain times longer stretches. In the study, people lost accuracy on intervals over about two to three seconds.

Does a distorted sense of time mean the session is going badly?

No. An altered sense of time is one of the most commonly reported features of a psychedelic experience, and in this study it showed up even in healthy volunteers doing plain timing tasks. It is part of the state itself, not a signal about how well the deeper work is going.

Will my sense of time go back to normal?

For the people in this study, the timing effects were tied to being under psilocybin, and short intervals stayed accurate even then. The distortion belongs to the acute experience, so ordinary timekeeping returns as the effects wear off. If you have lasting concerns, raise them with your care team.

Immersion

Does time feel different during a psychedelic session?

Short answer

Yes, many people feel time stretch, blur, or loosen during a psychedelic session, and a small controlled study backs that up. When people were given psilocybin, their sense of longer stretches of time, over roughly two to three seconds, drifted off, while very short intervals stayed accurate.

The research

Wittmann, M., Carter, O., Hasler, F., Cahn, B. R., Grimberg, U., Spring, P., Hell, D., Flohr, H., & Vollenweider, F. X. (2007). Effects of psilocybin on time perception and temporal control of behaviour in humans. Journal of Psychopharmacology, volume 21, issue 1, pages 50 to 64.

Sample Twelve healthy adult volunteers, each tested under both placebo and psilocybin in a double-blind laboratory design. This was a small study of timing tasks, not a study of a therapy session.

Published 2007

Journal Journal of Psychopharmacology

In 2007, Marc Wittmann, Olivia Carter, Felix Hasler, Franz Vollenweider, and their colleagues published this study in the Journal of Psychopharmacology. They set out to test something people had long described but few had measured: does a psychedelic actually change how the brain handles time? Twelve healthy adults took part in a careful double-blind design, which means that on any given session neither they nor the testers knew whether they had received psilocybin or a placebo. Each person worked through a set of timing tasks. In one, they tried to reproduce a time interval they had just been shown. In another, they tapped along in time with a steady beat. In a third, they simply tapped at whatever pace felt natural. The results pointed in one clear direction. Psilocybin threw off timing for longer stretches. People became less accurate at reproducing intervals longer than about two to three seconds, and less able to keep in step with beats spaced more than about two seconds apart. Very short intervals were left largely intact. People also tapped more slowly at their own natural pace. The disruption was specific to the longer durations, the kind that lean on attention and holding a length of time in mind.

Read the paper

What does this mean for you?

If time felt strange during a session, this study is a reason to take that seriously rather than brush it off. Under psilocybin, the way the brain handled longer stretches of time genuinely shifted. So the sense that a few minutes lasted an age, or that the session folded in on itself, is not just a story you told yourself afterward. It lines up with a measurable change in how time was being processed.

It is worth being clear about what this study can and cannot say. It was small, just twelve healthy volunteers, and it was run in a laboratory with timing tasks, not in a therapy room. It measured objective timing, the kind you can score with a stopwatch, more than the full felt texture of a session. And the effect was specific: longer intervals drifted while brief ones held steady. So read it as solid evidence that psilocybin changes time processing, not as a complete map of what your own session felt like.

Still, the direction is steadying. A warped sense of time in a session is a known, expected feature of the experience, not a sign that something went wrong with you. It is tied to the acute state, so it eases as the effects fade. Knowing that in advance can make it easier to let time do what it does, rather than fighting to track the clock. When the strangeness passes, ordinary time comes back.

The takeaway

A stretched or loosened sense of time during a session is common and expected, not a red flag.
The change is strongest for longer stretches. Short moments still feel about right.
You do not need to track the clock. Let time move as it will, and expect ordinary time to return as the effects fade.

Terms in this page

Set and setting Dissociation

This is the work Asendar™ was built for: helping you make sense of an experience that can bend even your sense of time, and carry what mattered into the ordinary days that follow. If you want a simple read on where your head is today, take your Mental Readiness Score.

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