You need it.
Your brain needs it.
According to the CDC, insufficient sleep is both a public health crisis and an "epidemic" in America. Whether its stress, lifestyle or simply trying to keep up with the job and home, we don't get enough sleep and that's bad for our brains.
When we sleep, the brain is "detoxified". The beta-amyloids associated with Alzheimer's are decreased.
Additionally, lack of quality sleep, whether from apnea, insomnia or simply lifestyle, increases stroke risk.
It's been suggested that one of the single most important things you can do for your health is to get a nightly dose of good, quality sleep.