Nothing beats the deep, restorative sleep you get in your own bed. Yet, in unfamiliar surroundings, falling asleep takes longer, and total sleep time shrinks. A study published April 21 in Current Biology—spotted by Le Temps—explains why: the "first night effect," a protective brain mechanism. Brown University researchers found that on the first night in a new place, the brain's hemispheres show unequal activity, keeping one partially alert.
A sleep specialist speaking to Le Temps draws parallels to animal behavior: "Cetaceans such as dolphins or whales, as well as certain birds, have cerebral hemispheres that sleep alternately. Cetaceans must breathe air at the water's surface voluntarily—unlike humans. Part of their brain must always stay awake to swim up and breathe." Our brains similarly heighten vigilance in novel, potentially less secure environments.
Reassuringly, this effect fades with repeated exposure, so frequent travelers adapt faster. Noticed how your personal pillow helps on trips? Medical News Today confirms it offers comfort, reducing disruptions. For your next getaway, pack that pillow or allow time to adjust—better sleep awaits.
