The conversation between human and AI assistant.
Is it normal to have no dreams while sleeping?
That's good to know. Can you tell me more about REM sleep?
Sure! REM sleep is characterized by the rapid movement of the eyes and a low muscle tone throughout the body. It's the stage of sleep where most dreaming occurs and is essential for cognitive function, memory, and mood regulation. The first cycle of REM sleep usually happens about 90 minutes after falling asleep and the length of each subsequent cycle increases throughout the night.