NBC'S KRISTEN DAHLG WITH THE FASCINATING DETAILS.
>> Reporter: WHITE NOISE, MUSIC, OCEAN WAVES, MILLIONS OF
AMERICANS REPORT USING SOME TYPE OF SOUND TO HELP THEM SLEEP.
NOW RESEARCHERS ARE LOOKING AT JUST HOW HELPFUL SOUND MAY BE.
>> WE CAN USE THESE VERY SIMPLE, NATURAL SOUNDS IN SLEEP AND BE
ABLE TO INCREASE THE AMOUNT OF DEEP SLEEP, WHICH THEN CAN ALSO
INCREASE MEMORY FORMATION. >> Reporter: SO THIS
IS VERY TARGETED? IN A SMALL STUDY, SHE PLAYED SHORT BURSTS OF
WHAT'S CALLED PINK NOISE, A LITTLE LOWER THAN WHITE NOISE LIKE
A WATER FALL. >> IT STARTS TO DELIVER NOW THIS PINK
NOISE PULSE. >> Reporter: RESEARCHERS TIME THE
BURSTS OF PINK NOISE AT PRECISE POINTS TO ENHANCE DEEP SLEEP.
DEEP SLEEP IS THE MOST RESTORATIVE PART OF THE SLEEP CYCLE.
WHILE A BABY SPENDS 40% OF ITS TIME IN DEEP SLEEP, BY THE
TIME WE'RE 80, WE SPEND ONLY 5%, GETTING THE MOST RESTFUL SLEEP
ESSENTIAL TO THE BRAIN. THE NEXT MORNING,
STUDY PARTICIPANTS PERFORMED 20% BETTER ON MEMORY TESTS THAN
THEY DID FOLLOWING A NIGHT WITH NO NOISE. >> SHE'S DOING MUCH,
MUCH BETTER. >> Reporter: HOW CONCERNED ARE YOU
ABOUT KEEPING YOUR MEMORY AND STAYING SHARP?
>> I'M VERY MUCH CONCERNED ABOUT IT. >> Reporter:
85-YEAR-OLD CHRISTINE LONG PARTICIPATED AND HER MEMORY TEST SCORES
IMPROVED. >> IT'S A BEAUTIFUL DAY.
>> WE ARE VERY INTERESTED IN BEING ABLE TO SLOW DOWN
BRAIN AGEING. >> Reporter: THE HOPE IS TO CREATE A CUSTOM
DEVICE FOR YOUR HOME THAT WILL TRIGGER YOUR
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