I occasionally get these things in the middle of the night and can deal with them if I wake up fast enough and stretch my leg out. I felt a little bit of tightening when I first got on the bike, but thought the peddeling would loosen it up. I forgot all about it for the first 5 minutes into the ride until it snuck up on me. Next time I WILL BE READY FOR IT, and hopefully deal with it more gracefully than I did this time!