workout woes

I worked 40 hours of overtime during my weekend. I got off a 16 hour overtime shift this morning. I've been working like this since December. I'm so tired. I can't even get the energy to get up to fix another cup of coffee, much less get the energy to workout. I'm hoping to find a way to get in a 75 minute bike ride before I have to go back into work tonight. I missed Monday and Tuesdays workouts, I can't keep missing training like this or I'll be back to being a fat slow Clydesdale in no time. Must.... go... ride....