Читать книгу The Art of Sleeping - Rob Hobson, Rob Hobson - Страница 34

35 As the name suggests, REM sleep is characterized by rapid eye movements as your pulse and breathing quickens, but the rest of your body remains motionless. It is during REM sleep that you’re more likely to dream, and this is also the stage that occurs before you wake up. A single sleep cycle is made up of four stages, each lasting around 90 minutes, which alternate cyclically throughout the night. e first three stages of the sleep cycle are NREM, each of which have their own set of unique characteristics, including brain wave patterns, eye movements and muscle tone – this takes up around 75 per cent of the cycle. REM sleep occurs in the fourth stage of the sleep cycle, taking up around 25 per cent. STAGE ONE Stage one is a short transition lasting only 5–10 minutes. During this unrestful stage, your eyes are closed but sleep is shallow, and you still have a sense of awareness. In stage one your brain is dipped into sleep, but you don’t feel as though you are asleep. It is during this stage of sleep that you’re most easily woken.