Impairment in the body's internal clock, ultimately disrupting a person's sleep-wake cycle, is just one of the potential symptoms of dementia.

CNN: Building relationships amid memory loss

But Drucker also urged those complaining of burnout and exhaustion to examine whether overwork or sleep loss was the real problem or whether they were just sick of their jobs.

FORBES: Should the Boss Send You to Bed?

How to afford childrens' school tuition and health care costs robbed just three percent of sleep, the survey said.

CNN: Money worries rob workers of sleep, study shows

He concludes that what Americans have come to think of as sleep problems are mostly just problems in the way Americans have come to think about sleep.

NEWYORKER: Up All Night

Most of the guys recover actively but some just sleep.

BBC: Clive Stuart-Smith column

But that just scratches the surface of the potential market for sleep aids, says Matthew Geller, a biotech analyst at CIBC World Markets.

FORBES: Sleep On Demand

A's manager Bob Melvin had to scrap his normal postgame routine just to get home in time to catch a few hours of sleep before returning to the ballpark.

NPR: Tired Tale: Moss, A's Reflect On 19-Inning Win