In my last blog we were reviewing the fundamental question of why we sleep. We left off trying to sort out the level of activity of the brain and body during different stages of sleep (i.e. Non-REM and REM).
During non-REM the body and brain are at their most relaxed state. Ironically, most people think of REM as deep sleep, but actually during REM the level of brain activity resembles the awake state. Our most vivid dreams occur during REM, signified by the highly active brain. In...

