Beyond drowsy, too little sleep ups diabetes risk

More people pull the night shift. Teens text past midnight and stumble to class at dawn. Travelers pack red-eye flights.

Nodding off behind the wheel isn't the only threat from a lack of shut-eye. There's growing evidence that people who regularly sleep too little and at the wrong time suffer long-lasting consequences that a nap won't cure: An increased risk of diabetes, heart disease and other health problems.

"We have a societal conspiracy for sleep deprivation," says Russell Sanna of Harvard Medical School's sleep medicine division, who attended a TEDMED conference last week where scientists called sleep loss one of health care's big challenges.

Just how unhealthy is it? Consider how sleep may play a role in the nation's diabetes epidemic.

Studies have long shown that people who sleep fewer than five hours a night have an increased risk of developing Type 2 diabetes, the kind that tends to strike later in life.

Rotating shift work

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