Well I ended up going without a nights sleep after getting ME1 and don't really think at any point between installing it (which granted, was about 8pm anyway) and when I finally fell asleep from exhaustion (which was about 2am the day after the day after) I stopped for more than an hour.
Well my excuse was I'd just gotten home from a long hard term of lots of final year work at Uni, with only a laptop, and suddenly had this pretty sweet desktop, this amazing game, and then ME2 and DA:O to look forward to as well. So I was a bit hyped up about it all and had been a long time without fun, and even longer without decent computer game based fun.