The spring time change can mean waking up a little groggy. But the situation may be worse for many teenagers who appear to be getting less sleep than ever, according to a new report in the Journal of the American Medical Association.

Teens are getting less sleep than ever -- and it's becoming a crisis. The downsides of poor sleep are well-documented, especially for teenagers, who are at risk for depression, anxiety, impaired brain function and multiple sclerosis later in life.