Should I go to sleep an rest for my test or finish my project?

I have a big science final tomorrow. Right now I have exactly 100% for my grade this quarter and a 94ish overall for science this year. I have a big english project that I am currently work on. I could finish it in about 2 and a half more hours. But it's midnight. I don't want to be super tired for my final. Should I just finish my project, and get 4 some hours of sleep? or should I go to sleep now, and make an excuse and say I'll bring my english project tomorrow. She said if we brought it late it would be a 50% but I think she's bluffing (she usually does and I am a good student) Yeah, I probably shouldn't have procrastinated. thanks.