Sorry it has taken so long for us to respond to your post. By now you've been to your doc about your headaches, so I'll squeak under the fence with the old "better late than never" queary. What did he/she have to say about them?
I can't say that I had your personal experience with late night headaches, but perhaps someone else on this forum has, and hopefully they will respond soon to your concern. This post will pop you back to the top, so I truly hope we haven't lost you!
Peace
Greenlydia