Why is sleep important? слайд,презентация

Every night we experience four or five sleep cycles, which are made up of four different  stages. Each stage is quiet different and shows our well-being and health.

When a child or a a teenager is in deep sleep, their body produces growth hormonoes, so maybe there is some truth in the old saying: “Early to bed and you will grow tall”.

If you live an average lifetime, you will spend about twenty years asleep.