Some of us sleep up to a third of our life away, which seems wasteful to many. It isn't, and a new study out of the UK says that too little sleep -- and even too much of it -- can double the risk of death from heart disease.

Yikes -- sounds serious, right? It's pretty well known that those of us not getting enough sleep see a marked decrease in how alert and productive we are when awake. But, heart disease?

The study involved 10,000 participants and looked at the amount of sleep each received correlated against the mortality rare of the group after adjusting for all kinds of factors, like age, race and sex. Conclusion: get in your required seven hours of sleep every day.