Why Do We Sleep?
A third of our lives is spent sleeping, but our understanding of our body's need for sleep is still evolving. Take a look behind the science of dreams with these great videos.
Key Facts In This Video
Everybody has about three to seven dreams a night, even if they don't remember them. (0:17)
Performing "reality checks" in dreams can lead to the realization that you are dreaming. (0:36)
Trying to stay aware while the body falls asleep may cause the temporary condition known as sleep paralysis. (1:38)