Everyone should have had this phenomenon, in a new environment will feel bad sleep, some people think that this is their own bed, do not sleep well in their own bed, do not sleep steadily. The researchers call this phenomenon the "first night effect" (FNE), referring to the poor quality of human sleep on the first night in a new environment, and sleep researchers have been looking for the physiological root causes of human FNE.
<h1 class="pgc-h-arrow-right" > a team of researchers at Brown University found a reason you don't sleep well in your new environment: Half of the brain stays alert and alert, a protective mechanism. </h1>
On the first night in the new environment, the researchers found that the subjects' brains showed "regional hemispheric depth asymmetry" during their first sleep cycle. This means that one hemisphere of the brain (usually on the left side) shows more activity, which is mainly concentrated in the default mode network (DMN). DMNs include brain regions that are responsible for daydreaming and other surrounding thought patterns while awake and resting. These areas of activity in one hemisphere mean that half of the brain has a significantly reduced depth of sleep. Researchers refer to the alert DMN as the "night watchman."
The researchers also tested reaction times in the sleeping and alarming hemispheres. They found that sleep-deprived hemispheres responded to stimuli (such as dogs barking or slamming doors) more quickly than half of the brain during deep sleep. Thus, the researchers not only hypothesized that the hemisphere of the semi-alarm was the cause of the FNE, but that the FNE itself was a manifestation of the human brain maintaining a "vigil" in the new environment. Other animals, such as dolphins, use partial sleep as a way to stay alert to predators or other threats. The team suspects that the asymmetrical depth of human sleep they found may have a similar function. On the first night in a new environment, it only makes sense for the brain to remain alert to protect us.
<h1 class= "pgc-h-arrow-right" > researchers believe that this brain activity could explain the "first night effect" of many experiences of sleeping in new environments. </h1>
