How much sleep do you really need?

We all need sleep in order to survive, but some of us need more hours each night than others. While it’s not understood exactly why this is, scientists may be one step closer to uncovering the complexities of slumber.
In a new study published on Thursday in the journal PLOS Genetics, researchers used artificially bred fruit flies to examine the role of genes in the sleep process.

How much sleep do you really need?