Medicine & Health
What is Sleep?
Sleep is a daily state of rest where your brain and body recover. Far from 'switching off,' your brain stays busy — clearing waste, storing memories, and repairing tissue. Skip it, and focus, mood, and health all suffer.
See it, don’t just read it.
Watch a 2-minute lesson with voice + animation that explains sleep.
Key things to understand
- 1A daily state where brain and body recover.
- 2The brain cycles through light, deep, and REM stages.
- 3It consolidates memories and clears waste.
- 4Most adults need about 7–9 hours.
Frequently asked questions
- Why do we need sleep?
- Sleep lets the brain store memories and clear waste, and the body repair tissue and balance hormones — it's essential, not optional.
- How much sleep do I need?
- Most adults need 7–9 hours; teenagers and children need more.
- What happens if I don't sleep enough?
- Even short-term, it harms focus, memory, and mood; long-term, it raises the risk of heart disease, diabetes, and weak immunity.