What good are you going to be to anyone (including yourself) if you run yourself ragged? One thing we sometimes do when there is more to do is forego sleep to get it all done. But when you sacrifice rest, it can have some significant and undesirable consequences. You can become irritable, lose your focus easily, have difficulty completing tasks, be more vulnerable to illness, and the list goes on.
Do yourself a favor and make it a point of getting your optimal amount of sleep each night (from 7 to 9 hours). If something has to go because you just have too much on your to-do list, find something else to sacrifice.