A new study finds working out in the morning -- helps you sleep better at night.
Researchers at Appalachian State University measured the sleep quality of a group of adults -- who worked out in the morning, afternoon or evening -- on separate occasions.
When the subjects exercised in the morning they spent 85-percent more time in light sleep and 75-percent more time in deep sleep than when they worked out during other parts of the day.
Morning exercise also boosted the number of sleep cycles each night by 20-percent.
The national sleep foundation estimates one quarter of americans don't get enough sleep.