Hi, whats primarily different about when you wake up is that your mind and body is in a relaxed state. This is a time when the dystonic reaction is at the minimum typically. I think most people with FD find the tightening after playing for some time. I try to be conscious of keeping my hands, mind and body as relaxed as possble while playing. Since the symptoms of FD are incorrect muscle contractions, its important not to force your hands to play when you are notice the tension or you will be reinforcing the wrong patterns. As much as possible take frequent breaks and dont practice for long sessions at a time.
