THE BRONX - A rigorous workout can leave you worn out and tired, but according to a new survey, exercising could actually make you sleepy.

A new study by the National Sleep Foundation says exercise may be the key to a good night's sleep.

According to the poll, which surveyed 1,000 people nationwide, those who exercised just 10 minutes a day were significantly more likely to report that they had a good night's rest.

Those who worked out vigorously had the highest quality of sleep, but the study concluded that any type of exercise showed improved sleeping.

The study also showed that it didn't matter what time of the day people exercised: the benefits stayed the same.