This is a list of problems you might have from sleep deprivation, and they are serious. And professional athlete, or military ops can tell you that sleep is a weapon, and effectiveness is directly related to performance.
But this article goes much further and gathers the data.
Your skin will wrinkle, you will get fat, you will be lonely (because you have bad skin and are fat?),
You will be stupid and make bad decisions, you will pee too much, you will snore and you will die early.
So get your rest, like your momma has been telling you!