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SLEEP AND INSOMNIA: SLEEP STATES
Stage 1: This first stage, the lightest, is the transition from wakefulness to drowsiness; as we enter it our muscles relax, the blood pressure drops, and the heart rate and digestion slow down. The brain begins to produce hormones such as serotonin and melatonin which are associated with sleep and sleepiness (whether they actually cause sleep is under debate).
At the same time, there is an increase in alpha waves, brainwaves of 7-14 cycles per second, which are typical of relaxed wakefulness; alpha waves also appear in people who are meditating, or under hypnosis. This stage lasts between one and ten minutes in the normal sleeper; although we return to it at intervals during the night, it usually occupies only about 5 per cent of our sleep.
Stage 2: This stage starts quite soon after falling asleep and occupies about 45 per cent of human sleep. It contains a mixture of deeper, slower brainwaves: theta brainwaves (3.5-7.5 cycles per second) typical of drowsiness and light sleep, and slow delta waves (under 3.5 cycles per second), during which we are really unconscious.
Stage 3: which occupies only about 7 per cent of sleep in young adults, is another transition phase to deeper sleep; as delta wave activity increases, we are taken fairly rapidly into Stage 4.
Stage 4: is the deepest form of sleep, with delta brainwaves predominating; it makes up about 13 per cent of sleep in the young adult. We stay in Stage 4 for quite long periods before surfacing again to REM and Stage 1 several times during the night.
REM Sleep: Rapid Eye Movement sleep is so called because the sleeper’s eyes move, indicating that they are dreaming. It occurs during Stage 1 sleep, and increases in quantity later on in the night. It has now been found that we also dream during deeper stages of sleep.
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