I feel so bad for my Boyfriend, everytime I'm in the mood to have sex I fall asleep before he even…

I feel so bad for my Boyfriend, everytime I'm in the mood to have sex I fall asleep before he even gets out of the shower cause in always so drained! And then there's days I don't even wanna think about sex or fun time as we call it. It's been almost a month since we've done anything! I feel fine but him on the other hand lol