i'm 67 yrs old. ride my bike 50 to 100 miles wkly for about a year also lift weights 3 day aweek and exercise the other days. I was feeling great and youthful. about 3 weeks ago I started to slow down and started to feel sleepy several times a day and would take a nap. my biking is down to 20 mile aweek. and i'm having troble completing my other exercises and weights. And now I'm having a hard time motivating myself to do anything. except to lay around. I did have heart surgury (1 stint)in july of 2008. That's what got me started biking, exercising, and weight lifting. I'm 5ft 6in tall and 170 lbs before surgury and now I'm 5ft 6in and 155lbs. I'm not sure if i'll getting depressed or having some other problem. tks ron