I often get the same thing when I am trying to go to sleep. I found that if I use an airplane pillow (the ones that go around the back of your neck) at least at the beginning of the night, it can help me fall asleep. A lot of times if I use a softer pillow or prop myself up a little more so less pressure is on my head it helps. Basically I when I feel like this I cant have any extra pressure on one spot, it needs to be more spread out and away from the temples.
Good luck!
Margarite