After the sleeper falls asleep, he or she enters into what is known as the Stage 1 of non- REM sleep. Brain waves become smaller, slower, and somewhat irregular characterized by a low-voltage fast EEG. This portion of sleep is distinguished by drifting thoughts and dreams that move from the real to the fantastic, along with a kind of floating feeling. Stage 3 is the beginning of deep sleep, occurring about thirty to forty five minutes after you first fall asleep.

Brain waves are slow (at the rate of 0.5 to 4 per second) and quite large (five times the size of waves in Stage 2).
The brain waves (called delta brain waves) are quite large, making a slow, jagged pattern on the EEG. After the first phase of deep sleep ends, the sleeper returns to Stage 2 and then enters the REM state.
Slow wave sleep comes mostly in the first half of the night, REM in the second half.  Waking may occur after REM.

If the sleeper is a sleepwalker or a bed wetter, those activities will begin in this phase. The sleeper will gradually descend deeper into sleep, becoming more and more detached from the outside world and progressively more difficult to awaken.

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Comments Stage 4 sleep eeg

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