Sleep consists of two distinct states: REM (rapid eye movement) sleep and NREM (non-REM) sleep. Dreaming occurs mostly in REM sleep.
Sleep is a cyclic phenomenon, with four or five REM periods during the night, which accounts for about 25 percent of the total night’s sleep.
Examples Of Sleep...
Earlier this month, I learned that I have mild sleep apnea. The path that led to my diagnosis was a bit round-about. If you remember in... Read more »
Sleep problems are common among elderly people and can be problematic in people with Alzheimer's disease. They can occur at any stage of... Read more »
If you notice periods of depression that seem to accompany seasonal changes during the year, you may suffer from seasonal affective disorder (SAD).... Read more »