Why cannot sleep well in a new place?

Why cannot sleep well in a new place? 

 
Turns out that in the new environment, one of the hemispheres of the brain retains increased activity, so that in case of danger the sleeping person reacts to it more quickly. 
 
When observed by scientists, such manifestations were found only on the first night in the laboratory; on the second night the person slept much more peacefully. 
 
On the first night, the left hemisphere and reacted more strongly to external stimuli. The increased activity in the left hemisphere also influenced the increased number of awakenings. 
 
According to scientists, this mechanism is a kind of night watch to protect the sleeper in an unfamiliar environment.

Sleep well and good well .

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