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Delta
Delta Wave
Delta
Delta
alpha
Slow wave sleep occurs after Stage 1 and Stage 2 sleep, and prior to REM sleep. There is more slow wave sleep present toward the beginning of the night, while more REM sleep is present toward the end of the night's sleep. In slow wave sleep, delta waves are present on the EEG (Electroencephalogram), which measures brain activity. These waves are long and slow, as opposed to the sharp waves of Stage 2 sleep. It is ecause of the shape of these waves that the stage is called slow wave sleep.
Lots of alpha-theta brain wave activity mean that you are relaxed. This is because alpha-theta brain activity occurs during the sleep cycle.
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'.
a brain wave
True. Brain wave activity changes from the waking state through the various stages of sleep, but the brain is active all of the time. When the brain is no longer active at all, death is at hand.
True. Brain wave activity changes from the waking state through the various stages of sleep, but the brain is active all of the time. When the brain is no longer active at all, death is at hand.