-- Sleeping during the day -- a necessity for jet-lagged travelers and those who work overnight shifts -- disrupts the rhythms of about one-third of your genes, a new study suggests.
What's more, shifted sleep appears to disrupt gene activity even more than not getting enough sleep, according to the research.
For the new study, which was published in this week's issue of the journal Proceedings of the National Academy of Sciences, British researchers put 22 healthy, young volunteers in a dimly lit sleep lab for three days.