Possibly the blood sugar - even though I wasn't testing nec. high...

Because of ER trip, I had CT scan with contrast fluid where I couldn't take the Metformin for two days. Although the sugar was not terribly high, it was higher than what is recommended...and that could result in sleepiness like that.

I am still exhausted, and just drink a bit and then fall asleep with all sorts of noise around again...this is very weird, and the only "new" thing is my extended swimming with the swimming board.

It could be though that I over exercised, and I was over physical on that particular day because I just felt so good and so normal that day, and the swelling kicked in big-time.

This was a very big surprise.