When you are sleep for a couple of hours
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
Sleep paralysis typically occurs during the stage of sleep known as REM (rapid eye movement) sleep.
stage 4
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.
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
No, REM (Rapid Eye Movement) sleep does not occur during stage 3 sleep. Stage 3 is characterized as deep sleep, which is part of non-REM sleep. REM sleep typically follows the non-REM stages, occurring after stage 3 in the sleep cycle. During REM sleep, brain activity increases, and vivid dreaming often occurs.
Snoring typically occurs during the deeper stages of sleep, known as REM (rapid eye movement) sleep.