New research says sleep is the second biggest factor in how long you live. Here's what the science actually means for you.

A new study suggests that a certain number of hours of sleep each night — between 6.4 and 7.8 hours to be exact — is ...

A study has linked both sleeping and sitting for more than 8 hours to a higher risk of dementia. Tunvarat Pruksachat/Getty Images “The treatments that exist can slow progression in some people, but ...

Add Yahoo as a preferred source to see more of our stories on Google. Some snake oil salesmen and alternative health gurus like to stoke the fear of cancer to sell a product or claim they have found a ...