I walked 18 holes ( shot 86....good for me ! ) + came home and push-mowed my lawn, yesterday. It was hot + humid ! Had to go to bed early - I was so tired. The AC was blowing on my lower legs all night. ***** 3 a.m. ****** I roll over, pulled my right leg up over the pillow I sleep with between my knees. WHOA !!!!!! My flexed right hamstring locks up FAST. I rolled onto my back + tried to point my toes to my chin. I'm starting to wince + moan......I didn't want to wake the baby and my wife. After a good 60 second fight.....I got it under control. It was locked so bad -- I pulled my leg up toward the ceiling and yanked my ankle up , so the hamstring would be stretched. I held it there for 5 minutes !......looking at this strange shadow of my leg + arm on the wall + ceiling. I never did straighten it out completely. That sucker was getting to a VERY PAINFUL level--- whew !.......I just caught it or I would have had to have help. . My hamstrings have been "tight" my whole life. But as I youngster.....they didn't cramp. . I ain't no youngster anymore ! . Anybody else ?