But how much sleep do we really need in order to get these benefits national sleep foundation guidelines advise that healthy adults need between 7 and 9 hours of sleep per night babies young children and teens need even more sleep to enable their growth and development people over 65 should also get 7 to 8 hours per night.

We tend to think of sleep as a time when the mind and body shut down but this is not the case sleep is an active period in which a lot of important processing restoration and strengthening occurs exactly how this happens and why our bodies are programmed for such a long period of slumber is still somewhat of a mystery but scientists do understand some of hellip.

Newborns from 0 3 months babies need between 14 and 17 hours of sleep this includes daytime naps since newborns rarely sleep through the night older infants 4 11 months need about 12 to 15 hours of sleep each day toddlers between the first and second year of life toddlers need between 11 and 14 hours of sleep each night.

In fact we now know much more about the function of sleep and scientists have developed several promising theories to explain why we sleep in light of the evidence they have gathered it seems likely that no single theory will ever be proven correct instead we may find that sleep is explained by two or more of these explanations the hope.

The fact that small improvements in sleep can be amplified into much larger economic gains is something of a wake up call if everyone in the us who sleeps fewer than six hours a night got between six and seven hours there hellip.

How much sleep you need depends on many different factors including your age genetics and how well you sleep at night however 7 ndash 9 hours per night is ideal for most adults tips for better sleep.

National sleep foundation ldquo shift work and sleep sleep hygiene the sleep environment harvard medical school division of sleep medicine get the sleep you need sleep and health.

Why do we close our eyes when we sleep there are several reasons why most people sleep with eyes closed though some people do actually sleep with their eyes open closed eyes stay moist and are protected by the eyelids during sleep eyelids also block out light during sleep and light signals to the brain that it is time to wake up.