Sleep apnea (Lack of sleep)
What,s about sleep?
We all
have an unclear concept of what sleep is, however that does not mean
that defining this mysterious part of our lives is
simple. After all, elaborate analysis of our own sleep is
not a possibility, only if we tend to rarely know what
we're sleeping when we're asleep. And even if we are likely
to observe the sleep of others, so much of what they
experience—changes in the functions of their brains and bodies—is
not easily seen from the outside.