Yup. My hand, wrist and forearm do swell up like that from time to time. For me, it is usually when I have bumped my hand or have just done too much.
I can't believe you managed to sleep for that long! You really must have needed it. It is never easy for any of us to sleep, is it?
I'm glad your swelling has gone down a bit for now. I hope you are getting back to normal after all your activity lately.
Take care.
KimA