❓ why
Why do we sleep?
ScienceBiologyHealth
Quick Answer
Sleep lets the brain and body repair, consolidate memories, and clear waste. Humans spend about a third of their lives asleep.
The Full Story
Sleep is a fundamental biological need found across the animal kingdom. During sleep the brain strengthens and files memories, the body repairs tissue and releases growth hormone, and a system called the glymphatic system flushes out metabolic waste that builds up while we are awake. Sleep cycles alternate between deep slow-wave sleep and REM sleep, when most vivid dreaming occurs. Chronic sleep loss is linked to impaired memory, weakened immunity, and higher risk of heart disease.
Key Facts
1.Humans spend about a third of their lives asleep
2.The brain clears waste faster during deep sleep
3.A full sleep cycle lasts roughly 90 minutes
YouTube Angle
Suggested video title for this topic:
"Why We Sleep — What Your Brain Does While You Rest"