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This is a short transitional stage, lasting only about 10-15 minutes. Your brainwaves will start to slow down from the normal ‘alpha rhythm’ measurement of 8-12 cycles per second, your muscles will start to relax and your eyes begin to roll. Polysomnographs taken at this stage show a 50 per cent reduction in activity compared to when awake. Although your eyes will be closed, if you are aroused from sleep at this stage you may feel as if you have not slept at all.

Hypnogram

Set of traces