It is amazing how many negative effects lack of sleep has on your body.
We all know we do not perform our best when we are tired but aside from the obvious side effects we observe there are side effects that you may not be aware of.
Short term effects include forgetfulness, slow reaction time, lack of sex drive, and impaired judgment.
Long term effects include aging skin, symptoms of depression, increased risk of death, increased obesity and serious health problems.
The article in the link below describes 10 side effects due to lack of sleep; a few of which I have listed here.