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circadian rhythm
Your body’s 24-hour internal clock that controls sleep, wakefulness, and other daily patterns.
dreams
Images, thoughts, and stories that happen in your mind during sleep.
insomnia
Trouble falling asleep, staying asleep, or getting good-quality sleep.
narcolepsy
A disorder where people suddenly fall asleep during the day.
nightmares
Scary dreams that cause fear or anxiety.
non-REM sleep
The quieter, deeper stages of sleep without dreaming.
REM sleep
The stage of sleep where most dreaming happens; your brain is active, but your body is still.
sleep stages
The repeating cycle of light sleep, deep sleep, and REM sleep throughout the night.
theories of sleep
Ideas explaining why we sleep (restoration, memory, growth, safety, energy saving).