One eye open: Just in case

(Photo by Alexageev)

Along with two eyes, most humans have also been gifted with two sets of eyelids.  This makes it theoretically possible to sleep deeply with one eye open.

But why?

Researchers from Brown University believe that safety is paramount when sleeping in a new location.  For example, the first night in a new hotel is often a restless one.  Experiments have shown that “part of the left side of the brain” remains “more active… specifically during a deep sleep phase known as slow-wave sleep.”

This allows the sleeper to awake quickly if the doorknob starts creaking at 3 a.m.  The brain usually settles down after the first night in an unfamiliar place.  However, when travelers change beds frequently, the cumulative effects begin to take their toll.

Resources

http://www.foxnews.com/health/2016/04/21/why-dont-sleep-well-in-strange-bed.html 

Copyright May 20, 2016 by Linda Van Slyke   All Rights Reserved