You went to sleep.
Your night kept moving.
Light sleep. Deep sleep. Dreaming. A brief waking. Your brain moves between different states — and two powerful systems help set the timing.
Which sounds most like you?
Choose a question you have wondered about. Your choice is not saved.
Two parts of the same story.
A night is a pattern,
not a single state.
You do not need to memorise every stage. The useful part is understanding why sleep changes — and why enough time, quality and timing all matter.