Get Enough Sleep!

A viral video has revealed the shocking detrimental effects that sleep deprivation can have, both on your mental and physical state. Matthew Walker, the author of Why We Sleep and professor of neuroscience and psychology at the University of California, Berkeley, explained how sleep or lack thereof can seriously impact your health.
Watch the video below and try to answer the following question: 

How much time can we spend awake before we our mental and physical capabilities start to become impaired?