I use to get headaches while I slept. I would know the headache was starting during the night but was to sleepy to wake up all the way to do anything. Due to other things I went for a sleep study and found out I have sleep apnea. Headaches can be a symptom of sleep apnea. Just something for you to consider. I did have other things happening at night.

Yes, I get head aches if I don't sleep enough, or if I sleep and its really hot and uncomfortable

I found out whay I was getting the headaches. It was because I was sleeping wrong. We bought a new mattress, and since then, I really haven't had a headache in awhile..... :d