As early as their 20s, people can experience a decline in the efficiency of their sleep receptors.
If you've ever been up all night, you may have found that staying awake becomes a lot easier after five or six a.m. Why?
If you've ever stayed up the whole night through, you may have noticed that you begin to feel cold in the hours just before morning. Why does this happen?
Suppressed thoughts often come alive in dreams, because our mental control centers doze while we do.
We don't sneeze while we're asleep because our sneeze reflexes are taking a snooze.
Alcoholic beverages may make you drowsy, but actually reduce your quality of sleep.
Lonely hearts club members get less deep sleep than their coupled counterparts.
Losing a couple hours of sleep each night adds up to major sleep deprivation.
Sleep loss negatively affects school performance more than binge drinking or smoking marijuana.