After you close your eyes, there is actually a certain point that brain activity falls off sharply, plunging until it reaches ...

Brain activity from more than 1000 people shows a rapid transition from being awake to being asleep, rather than a slow ...

You may fall asleep occasionally when you sit down if you don’t get enough high quality sleep. Falling asleep regularly when you sit down, however, may be a symptom of a sleeping condition that could ...