You don't "lose" consciousness when you fall asleep. Sleep is not the absence of consciousness, but the consciousness of absence. What's missing is what you thi

You don't "lose" consciousness when you fall asleep. Sleep is not the absence of consciousness, but the consciousness of absence. What's missing is what you think of as your "mind". If that's not the case, then ask yourself who is it that is sleeping? What registers the coming and going of the mind? That's you, the consciousness. If consciousness was going away, you would never know that you slept.