- Experts say a frequent desire to nap or sleep late could be a sign of a health problem
- Sleeping in over the weekend could lead to "social jet lag"
- One to two weeks should be enough time to catch up on lost sleep
Vital Signs is a monthly program bringing viewers health stories from around the world.
(CNN)Do you sleep between seven to nine hours per night? According to the experts, this is the amount needed, on average, to keep our minds alert and our bodies healthy -- but many people aren't getting enough.