1.   As she fell off the bike, her head hit the pavement.

2.   Do you fall asleep as soon as your head hits the pillow, or do you toss and turn for hours before dropping off?

3.   Her head hit the beam and she slid down and hit her shoulder.

4.   Her head hit the concrete with a sharp crack.

5.   His head hit a table as he fell and he knocked himself out.

6.   His head hit the door with a sickening thud.

7.   His head hit the floor with a sickening thud.

8.   However, the parties involved were prepared to have their heads hit together to arrive at a solution.

9.   I fell asleep as soon as my head hit the pillow.