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The stage during which it is most difficult to wake someone is the "deep sleep" stage. During this stage, brain waves, breathing, and heart rate are the slowest.
It happens in the 4th stage
Bedwetting, or nocturnal enuresis, is most likely to occur during Stage 3 or Stage 4 of non-REM sleep, which is deep sleep. During these stages, the brain may not respond to signals from the bladder indicating the need to urinate, leading to involuntary bedwetting.
3,4. Both stages are now combined and are just called stage 3, SWS ( slow wave sleep) or deep sleep. Stage 3 is the deepest stage.
There are 4 stages of sleep: Stage 1, Stage 2, Slow wave sleep, and REM. The stages occur in that order. Stage 1 occurs as you are falling asleep, and REM occurs last and contains the craziest dreams. REM is the most difficult to awaken from, so it is likely the stage that you have heard referred to as 'deep sleep'.
Sleep paralysis typically occurs during the stage of sleep known as REM (rapid eye movement) sleep.
Stage 4 sleep. Stage 3 also often emits delta waves.
The pituitary gland releases growth hormone during the deep stages of non-REM sleep, particularly during slow-wave sleep. This hormone plays a key role in growth, metabolism, and tissue repair.
Stage 4
Delta sleep is stage four of the deep sleep cycle. This is necessary to feel well rested. to increase the Delta waves during sleep, regular exercise is the only method. Of course, exercise has other benefits.
The brain wave associated with deep sleep is called delta waves. These slow brain waves are characteristic of the deepest stages of non-rapid eye movement (NREM) sleep. Delta waves are most prominent during the restorative stage of sleep known as slow-wave sleep.
They occur during REM sleep, usually in the second half of the night