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When you are asleep, your eyes are closed, most of your muscles are relaxed, and your consciousness is practically suspended. But while your body is still, your brain is quite active. Your body’s internal systems control when you sleep and when you’re awake. If these systems get out of alignment, such as due to shift work or jet lag, sleep problems can result.
Scientists don’t fully understand why we need so much sleep, but it’s believed it helps us restore ourselves physically, as well as organise things in our brain. You need sleep so your body and mind can function properly. Sleep is thought to help keep your immune system strong and your heart and blood vessels healthy. It allows for growth and healing. It helps control your appetite and your weight. It’s also needed for attention, memory and learning.
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