Transcripts for KPIX CBS Evening News With Scott Pelley 2016

i'm going to say, ever. >> reporter: we asked cohen to chronicle a typical night. >> so, it's about 1:30, and-- in the morning. it's 3:20 and i did not go to sleep since 2:00, so i'm a bit overtired. >> reporter: she's not alone. nearly one-third of adults don't get the recommended seven hours of sleep daily. a new report out today by the national center for health statistics finds: single moms have the greatest difficulty; about 40% get less than seven hours, compared to 31% of married women. >> well, those are basically motion trackers. >> reporter: dr. daniel barone is a neurologist at new york- presbyterian weill cornell's center for sleep medicine. what does our body accomplish while we're asleep? >> really, the repair and recovery, at the cellular level, of every organ system that we have. our heart is given an break. our blood vessels are allowed to relax. our blood sugar goes down. >> reporter: there's no way of getting around the need to sleep. i mean, even if you want to live every minute of your day, you

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