20 Things You Didn't Know About... Sleep - - science news articles online technology magazine articles 20 Things You Didn't Know About... Sleep

10 In 1964 17-year-old Randy Gardner stayed awake for 264 hours and 12 minutes, the world's record. He then slept for 15 hours—not a record, but not bad.

16 Dreaming is connected to bursts of electrical activity that blow through the brain stem every 90 minutes during REM sleep. Over a lifetime, an average person spends more than six years dreaming, clocking more than 136,000 in all.

17 But nobody knows why we dream.