Why do we sleep?
The short answer
Sleep supports brain function, memory, learning, and physical health. The brain and body do not simply switch off during sleep; they continue work that helps us stay well.
What happens during sleep
Sleep moves through several stages, from lighter to deeper sleep, in repeated cycles during the night. Some stages help learning and long-term memory, while deep sleep supports recovery and energy regulation.
What happens when sleep is not enough?
Too little sleep can make focus, decision-making, learning, and mood regulation harder. Sleep needs vary with age and health. If severe daytime sleepiness or sleep problems continue, talk with a healthcare professional.
Sources
This article introduces general knowledge. Consult a healthcare professional about individual symptoms or treatment.