Sleep isn't just a time when the body shuts down — it's an active process essential for health. During sleep, the body moves through several stages, cycling between lighter sleep, deep sleep, and REM (rapid eye movement) sleep, when most dreaming occurs.
During deep sleep, the body repairs muscles, strengthens the immune system, and releases growth hormone, which is especially important for children and teens who are still developing. The brain also uses sleep time to sort and store memories from the day, helping with learning.
Without enough sleep, both the body and brain struggle to function well. Poor sleep can affect concentration, mood, and the immune system's ability to fight off illness, which is why getting consistent, quality sleep is just as important as eating well and staying active.