You need sleep not just for yourself, but because you need to perform well at work or be able to find work. You do a ridiculously poor job on low sleep and you easily become very cranky and mean.

When you are physically weak, you also become mentally, emotionally, and morally weak, so BE CAREFUL!!!

When you don't sleep, a lot of burden you could have taken care of gets shifted to others as well, and when you take these burdens upon yourself DESPITE low sleep, you can tend to do a very poor job. 

Ultimately, your family NEEDS you to sleep, so do.

- The Lord to me.