No energy!!!!

Charitey
I'm 17 weeks and 6 days. I have no energy to do anything!!!!! The bad part about that is we have a 4 year old that I homeschool and I'm failing! We haven't done school work in at least a week. I don't have the energy to do anything at all. I straightened up my kitchen just now and I'm ready for a nap. 
How are you combating no energy in your second trimester?