Russell Foster on Ted Talk outlined three reasons on why we sleep. I chose to agree with his one option restoration against the other two, energy conservation and brain function. In restoration there has been proof of genes that only turn on during sleep and that is only associated with restoration. Your brain behaves like a muscle when it comes to sleep. When you workout you need a full nights of rest for your muscles to recover. The brain needs to do the same; restore, replace and rebuild over the night. Without these three orders the brain won’t be able to be refreshed to go back to work. This the same as when you workout the somebody part everyday for a week. If you do this your muscles can’t be recuperated and will not grow correctly. Overall Russell Foster explained everything, but restoration stood out to me and has been proven and makes the most sense.