I discovered the reason

I went to the doctor about my inability to sleep. Part of the reason is the usual; my brain not shutting down long enough to actually achieve rest. He has recommended that I stop everything an hour before I want to sleep. No external stimuli, and see how that works. If not, I will be prescribed something. The other part of it is due to the nature of an important event coming up very very shortly.

This will be the first shared birthday in years. I suppose the knowledge of some many missed birthdays has stressed me out a little. I don't sleep because I fear waking up and finding that it's all been a dream. I feel once the date has passed, I will be 100% better.