Sleep study 2

Well last night at 9:30 I went in for my second and LAST sleep study. Everything was the same except for last night I had to sleep with a c pap machine (an oxygen machine / mask that sleep apnea people have to use). It's standard for all second nighters. I actually slept better the second night then I did the first night. I fell asleep earlier and without a sleeping pill this time. I did wake up around 3 or 4 (I guess...there are no clocks in the rooms) and I couldn't go back to sleep. All in all It wasn't to bad.