When you are sleep for a couple of hours
2:00 a.m.
They occur during REM sleep, usually in the second half of the night
Truly "deep" sleep does not occur during REM sleep. REM sleep is when you are dreaming. It is deeper than light sleep, but not as far down in unconsciousness as "deep" sleep.
Yes. Sleep apnea can occur at any age
REM
stage 4
They occur during REM sleep, usually in the second half of the night
This usually occurs in REM sleep, when dream states occur. It is not necessarily pathological.
sleep spindles
The rhythmic bursts of brain activity that occur during Stage 2 sleep are called sleep spindles. These are short bursts of brain waves that help in the consolidation of memories and are characteristic of this stage of sleep.
Bedwetting occurs at stage 3 of NREM sleep (Stage 4)
why do most heart attacks occur once you get out of bed
There are five stages of sleep; Stages 1-4, and then REM (rapid eye movement) sleep, in which dreaming occurs.