Yes, this is normal.
Because you haven't been moving around much, you've been sleeping. Physical activity increases heart rate.
well,some people wake up hungry but some people do not. if you wake up not ready to eat its because you didnt burn off your dinner while sleeping!
because your muscles are tired and they haven't move for 12 hour
Maybe because it needs to go to the toilet.
Only if you swallowed your pillow while sleeping.