Video narration
Does your brain switch off the moment you fall asleep? On your own night, as you drift off, it stays busy, changing its activity rather than powering down. You move through lighter sleep into deeper sleep, then REM sleep, a stage marked by rapid eye movements and often vivid dreams. The pattern repeats through the night, though its shape changes; it is not one fixed trip through the stages. And dreams can happen outside REM, too, even though vivid dreams are more common there. Your brain does not switch off. It changes its activity. Across your night, those shifts help support memory and your body's recovery, alongside other work sleep does. By morning, you have passed through these repeating stages, whether or not you remember them. So, when you wake, the answer is no: your brain was active, not switched off.