I clench my fists when I'm stressed, nervous, worried, etc. Amazingly enough, it's something I have likely always done but was never aware of until a friend pointed it out to me while I was in college. We were looking at pictures from our trip to Europe and he said "And there you are with your fists clenched again!" And I replied "What? What are talking about?" and he explained to me that I always clench my fists when I'm worked up.
And he was right! I never noticed it before then, but he made me aware of it and I tried to be more aware of it and let my fists go.
Lately, I'm not sure if I'm doing it more -- or if I'm more aware for some reason. I find myself in bed with my fists are clenched tight . . . sometimes all it takes is a conscious decision to relax them to let me fall asleep. I find myself sitting on the couch watching TV; and my fists are clenched tight.
I'm trying to let go . . . relax . . . and trust . . . and be at peace. Now if only my hands would get with the program!