Asthma and allergies more common in teens who stay up late

This shows a teenage girl and a teddybearThe chances of having asthma are three times higher in teenagers who go to bed late at night compared to those who sleep earlier. The risk of allergic rhinitis is two times higher for late sleepers. Researchers say they can not be certain that staying up late is a cause for asthma, however, they note melatonin is often out of sync in late sleepers, and that could be an influential factor in the allergic response.