Both Salvador Dalí and Thomas Edison are said to have used dreams to stoke their creative process. To spark new ideas, the men would let themselves drift off to sleep for just a few moments, and then wake up and note the dreamlike visions they had on the brink of unconsciousness.
But you may have heard that dreams happen only in a stage called rapid-eye-movement (REM) sleep. So is it possible to dream during other stages of sleep, as Dali and Edison supposedly did??
