I have had clonus many times - various degrees of it. The past 6 months I think it's worse upon awakening. Many times (not always) upon awakening, if my knees were up (feet flat on the bed), my legs shake like crazy for about 20-40 seconds - they just get real jerky and shaky and I have to kind of push them down and then suddenly I can get up and use them. Is that a represenation of clonus? If so, can it be due to back problems which i've do have? Thanks very much.