Can humans sleep with half their brain?
Unihemispheric slow-wave sleep (USWS) is sleep where one half of the brain rests while the other half remains alert. This is in contrast to normal sleep where both eyes are shut and both halves of the brain show unconsciousness. Can you be asleep and awake at the same time? Hypnagogia meaningHypnagogia is the transitional state of consciousness between wakefulness and sleep. It's the opposite of hypnopompia, which is the transitional state that occurs before you wake up.