For me, I gained some weight recently and got a mild case of sleep apnea. I discovered it using an android app to monitor my snoring. It was devastating hearing myself gasp for air at night! Sleeping on my side help reduce my snoring, that combined with quitting drinking and smoking, just a little bit of exercises, and a good diet reinvigorated my energy. I now get up naturally without an alarm clock around 6am to 7am, where before I'd sleep in til 10am and still be tired all day. I also eliminated coffee but only because it was a trigger for smoking and I'd like to go back to it some day. Of course talk to your doctor, but I was able to get well and avoid a doctors appointment. I knew he was just going to tell me to lose weight, quit drinking and smoking anyway. Who knew that could be so good for me, right? :)