Delirium is a common and very serious neuro-psychiatric syndrome. Typically it affects older patients with multiple medical problems, in fact up to half of all elderly patients in the hospital will have an episode of delirium at some point.
Narcolepsy is a disorder in which individuals lose the ability to regulate these sleep-wake cycles, so the standard boundary between sleeping and being awake is blurred, and that leads to characteristics of sleeping happening while a person is awake.
For a lot of people, sleeping is a time of rest, and the most movement you do is the usual tossing and turning. But for others, sleep can be a time to aimlessly walk around the house, drive a car, or cook a meal, all without them being consciously aware. This is called sleepwalking, or somnambulism.
Humans willingly delay sleep all the time. We stay up late for parties, we pull all-nighters to study for tests but going without sleep for too long will actually kill you. Here’s the reason why.