I got my results from edexcel at about 6/7am, cried over them for about half an hour, then decided I'd better check UCAS which had updated. I went to bed around one the night before and it hadn't updated by then. In fact I think UCAS themselves say there's no point in checking much before 7 as they're not going to update earlier.
There was a mix in my year of people who checked UCAS first and those who waited for their results. Personally I'm glad I did, as my results did not meet my offer, so had I not already seen I'd been accepted on UCAS, I would have assumed I had no where to go until I'd had the chance to check.