An Ancient Night-Watch System May Explain Why You Sleep Poorly on the First Night of a Trip

The first time a traveler lays their head on unfamiliar pillows can disrupt their sleep cycle, causing difficulty in falling asleep and frequent awakenings. This phenomenon is known as the first-night effect. According to research, during the initial night in a new environment, one hemisphere of the brain may remain more vigilant than the other, a survival strategy from our ancestors to protect against potential dangers in unfamiliar surroundings.

This can lead to sleep deprivation, reducing the brain's ability to learn and process information overnight.

Travel insomnia is a common issue, with up to 80% of travelers reporting poorer sleep away from home. Factors contributing to this include changes in routines, light exposure, surroundings, and a sense of safety. An unfamiliar bed is one culprit, but the confusion caused by crossing multiple time zones can also disrupt the body's internal clock, leading to irregular release of hormones like melatonin and cortisol. These disruptions can make you feel alert at unusual times, further impeding sleep.

To combat travel insomnia, it is suggested to gradually adapt to the destination's schedule, expose yourself to natural light, maintain a regular meal and exercise routine, and create a comfortable sleeping environment. However, even after a restless first night, travelers should not worry as the brain typically adjusts as it learns that the new bedroom is not a threat.