I found another story like this. This guy was witnessed by a couple people to get up in the middle of the night and return a few hours later. He woke up in shoes and clothes but didn't remember getting dressed. His watch was now 1 hour ahead and they couldn't figure it out: http://spirals-end.livejournal.com/54291.html
There has been unexpected musclepain in lower back similar to that you get from lifting weights with bad posture, otherwise rather opposite, been active, organized and upbeat the whole day, cleaned up messes long procrastinated over and kinda felt relieved of some weighting worries on shoulders. Though excellent weekend at cottage and music festival does adds up to that. I'll let you know if the watch acts up again. Btw, Can one edit blog posts? I can't seem to find the button for that.
Interesting. Let us know in the future if the watch ever acts funny again, that way we know that it's just not a crappy watch. Any fear or strange emotional changes?