Some days, there's nothing like a good nap, even if you know it might keep you up into the wee hours of the night. Later that evening, you try every trick in the book to get your less-than-tired body to give in and doze off. Have you ever pondered the secrets of sleep? Take this quiz to learn all about sleep and those little jumping sheep.
Question 1 of 10
First things first, do people really even need to sleep?
Question 2 of 10
OK, now that we know we need sleep -- got any idea why?
Question 3 of 10
Which brain waves are most commonly associated with deep sleep?
Question 4 of 10
Besides a great band, what's R.E.M.?
Question 5 of 10
How often do we experience R.E.M. sleep versus N.R.E.M. (non-R.E.M.) sleep?
Question 6 of 10
Reptiles, mammals and birds are all examples of animals that sleep -- but do they all dream?
Question 7 of 10
Are dreams completely random, or is there deeper meaning there?
Question 8 of 10
How much time does the average person spend dreaming during their lifetime?
Question 9 of 10
Is there such a thing as too much sleep?
Question 10 of 10