what can cause pressure in the back of your head is that the muscle in your neck is pulled
See a doctor and find out what is wrong with you, it could be something serious or nothing at all, the pain could make you angry.
Why do you use a cushion to sleep on? Because it's more comfortable =]
Yes you do. For proof: People's eyelids don't completely close when they are asleep. So wait till a person is completely asleep and at an angle so you see underneath the eyelid. It is open and all...