How does the body react to a new environment? What to expect and how to prepare

Imagine: you leave behind work, notifications, daily noise, and go on a retreat. A few days in a completely different place, a different rhythm, maybe silence, nature, different food. Sounds like perfect regeneration. Then it turns out that on the first day you have a headache, on the second you are irritable for no reason, and your sleep — instead of being deep and peaceful — is fragmented and strange.

A new environment is a small alarm for the brain

When you arrive in a new place, your nervous system automatically switches to increased alertness mode. This is an evolutionary mechanism; a new environment used to mean potential danger, so the brain prefers to be cautious. Scientists call this the "first night effect" — in an unfamiliar place one hemisphere of the brain sleeps more lightly as if standing guard.

A study published in Current Biology confirmed that during the first night in a new place, the left hemisphere of the brain shows significantly less deep sleep activity than the right one, resulting in poorer rest quality and greater reactivity to environmental sounds. (Source: Tamaki M. et al., "Night Watch in One Brain Hemisphere during Sleep Associated with the First-Night Effect in Humans", Current Biology, 2016)

In other words, your brain literally "watches" to see if the new place is safe. Only when it decides it is, does it relax.

The first days may be harder than you expected

What many people experience at the beginning of a retreat or a longer trip even has a name: stimulus detox. After years of functioning in an environment full of noise, notifications, and constant stimulation, your nervous system gets used to a high level of arousal. When it's suddenly absent, discomfort appears.

You may experience: irritability, difficulty falling asleep, headaches, strange anxiety, or a feeling that "you don’t know how to rest." This doesn't mean the retreat isn’t for you. It means it’s just starting to work.

Usually, this stage passes after 2–3 days. Then most people describe a clear change — the body slows down, breathing deepens, thoughts become calmer.

How to prepare to get through it more smoothly

Changing environment will always require an adaptation period. But this process can be made much easier.

Start slowing down before the trip. If on Friday at 6:00 PM you pack your suitcase after an intense week of work and the next morning you’re already at the destination, your nervous system hasn’t had time to adjust. If you can, reduce stimuli the day before departure: fewer screens, earlier bedtime, a calmer pace.

Don’t plan your first day to the brim. It’s tempting to "make every moment count," especially if the retreat is expensive or rare. But the body needs time to acclimate — to the new place, daily rhythm, and food. Leave space for nothing.

Reduce phone use gradually, not all at once. Suddenly disconnecting from all notifications may paradoxically increase stress levels, especially if you are used to being constantly online. Instead of a hard detox overnight, start limiting phone time several days before departure.

Accept the discomfort of the first days. This is probably the most important tip. If you know in advance that the first 48 hours may be difficult, you won’t interpret it as a signal that something is wrong. You just wait for your body to adjust.

What happens when adaptation ends

When the nervous system "tames" the new environment, something interesting begins. New surroundings, especially natural ones, actively support regeneration. Research conducted in Japan on the practice of shinrin-yoku (forest bathing) shows that being in a natural environment lowers cortisol levels, slows heart rate, and activates the parasympathetic system responsible for regeneration. (Source: Li Q., "Effect of forest bathing trips on human immune function", Environmental Health and Preventive Medicine, 2010)

In other words, your body didn’t just rest, it was repairing itself.

A retreat, trip, or environment change is not a magical reset button. It is a process with its own time and stages. If you know what to expect, you can stop fighting the first days and just go through them. And what awaits on the other side is usually worth every moment of discomfort.