Make sure you get the sleep you need each and every day. We might think we will accomplish more if we sacrifice a few hours of sleep, but that is not likely to happen.
If we don't have enough sleep, we will be sluggish. This will lower our effectiveness as well as our efficiecny. It could mean having to redo the things we thought we had accomplished.
There are really few things that can't wait until the next day. Get the needed sleep and reapproach things the next day with a refreshed mind and a revigorated body.