Why Do We Need Sleep?

We need to sleep, because it plays an important role in maintaining our overall health and well-being. Sleep gives the body time to heal and supports healthy growth. During sleep, hormone levels change and muscles relax, allowing tissues to heal and the body to build muscle and synthesize proteins that support recovery.

Sleep is also essential for brain function. While we sleep, the brain organizes and strengthens memories, helping us remember things and take in new information. One stage of sleep, called REM sleep, is especially important for memory and learning. During sleep, the brain also produces theta waves, which help with cognitive function and may help with emotional regulation.

Sleep helps regulate the body’s internal clock, known as the circadian rhythm. This clock keeps our sleep-wake cycle in sync with daylight and helps us stay alert during the day. Sleep also helps save energy and supports the immune system. Getting enough rest can lower the risk of illness and make it easier for the body to handle stress.