This year he described the increasingly commom phenomenon of ''social jet lag,'' experienced by those who sleep short on workdays, then stay up later but sleep longer on weekends.
If that is your pattern,you are more likely to be depressed and obese.
'' Sleep is one of the most underrated phenomena in modern society,'' Roenneberg says.
A growing body of research is showing that if you don't get enough or get it at the wrong times, you expose yourself to a wide range of health consequences.