TODAY | October 18, 2013
>> trending from the associated press, scientists may have figured out why we feel so sharp and refreshed after a restful slumb slumber. when we sleep, our brains get rid of the junk that piles up during the day while we're awake. the study appears in the journal of science and may have new clues to alzheimer's disease. your brain is like the garbage disposal of brains. it gets rid of all the junk.
>> i wish i wouldn't wake up with all the junk still there. so i don't believe all of this.
>> you have to get a good 8 hours of sleep.
>> solid sleep.
>> which means we all have dirty brains around here.
>> you cram in so much information every day that your brain naturally just kind of expels it at the end of the day to make room for the next day.
>> i think it has to.
>> the disk gets full and data falls off.
>> that's why people say who did you interview today? and you can't even remember.