Just wait til you have to go to the bathroom every 15 minutes ;)
Yes i been that way since about 7wks, I am 21.5 now... thankfully most week mornings I am able to catch an hour nap before I start housework and errands for the day.
When I'm hot, I feel sweaty when I wake up "/
Yes almost every night around 2am. I'm 28 weeks along. Its not fun!