A new study finds there could be thousands of Americans suffering from a sleep disorder they don't even know they have. The study found that 16-percent of those studied said they had persistent problems staying awake during the day, 31-percent said they can't sleep through the night, and 25-percent reported having trouble falling asleep. However, only 10-percent had been diagnosed with a sleep disorder. Doctors are worried because untreated sleep disorders can cause illnesses like diabetes, stroke and obesity.
