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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
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'.
Stage 4 sleep. Stage 3 also often emits delta waves.
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.
They occur during REM sleep, usually in the second half of the night
Stage 1
only during their cocoon stage
3/13/2012 jhh: REM sleep is NOT deep sleep. In fact, it is the lightest stage of sleep. In order from awake to deep sleep: AWAKE, REM, LIGHT, DEEP. Deep sleep and REM sleep are the most important stages though. Light sleep doesn't do much for you. Deep replenishes your body, while REM replenishes your mind. Older answer (not accurate): Yes. It is the deeper form of sleep that we experience during our sleep cycle, rem sleep is where dreaming occurs But not the deepest sleep, which would be delta. That's where, unless your a mother and hear your baby cry, you are oblivious to your environment.
none. if you can not sleep then you suffer from insomnia. The most restful sleep comes during the R.E.M. stage known as rapid eye movement. This is the stage you dream in. It takes about 2 hours to reach REM sleep.