BRAIN SLEEPING CYCLES
During a night's sleep, an adult will pass from a state of wakefulness through two kinds of sleep in alternating, 90-minute cycles. The first sleep is deep and largerly dreamless
BRAIN-WAVE ACTIVITY
Your brain constantly send out electrical signals, called brain waves, which represent its nervous activity. When you are awake or dreaming, the signal are more intense
An Adult sleeps for around eight hours a night. As an infant, you need 16 to 18 hours but this decreases with age, you enter deep, non-rapid eye movement sleep. At 90-minute intervals, you switch to rapid eye movement (REM) sleep, when you dream and your eyes move quickly as trough wathcing a film. About a quarter of your sleep is REM sleep
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