In short, you need sleep so your body and mind can function properly. Scientists don’t fully understand why humans need so much sleep, but it’s believed to help restore the body physically, as well as organise the brain. Babies spend at least half of the time they’re asleep in REM sleep. Adults usually spend about one-fifth of the night in REM sleep and the remaining four-fifths in non-REM sleep. REM sleep happens about every 90 minutes during the night. REM sleep is when most dreaming occurs and is thought to be important for learning and creating new memories. In REM sleep, your eyes move rapidly, your blood pressure and heart rate go up, and your brain becomes very active. During stages 2, 3 and 4, your eye movements stop, your body temperature drops and you are deeply asleep. During stage 1, you are transitioning between being awake and asleep, and wake easily. When you are in non-REM sleep, you go through 4 stages. If this system is disrupted - such as due to shift work or jet lag - you can experience sleep problems. Your body’s circadian rhythm (or, internal biological ‘clock’) control when you feel sleepy and when you’re typically awake. While your body is mostly still, your brain is quite active. When you are asleep, your eyes are closed, most of your muscles are relaxed and your consciousness is practically suspended.
Fortunately, there are many things you can do to improve your sleep.
Sleeping problems are common, with up to 4 in 10 Australian adults not getting enough good-quality sleep.
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