I have same exact issue. Right now I'm having some success with pregnenolone at night. I use it during the day with some success, but decided to try it at night.
So far it hasn't helped the wake up at 3-4 am, but has given me the best sleep I've had in ages. I'm thinking when the preg wears off, my cortisol is dropping off. This is happening after 5 or 6 hrs. So I need something that's lasts just a little longer. I tried td preg, but this was a little too strong at night.
Though I do prefer the td to the pill form in the morning. I have recently found a slow release pill form, and am waiting for it to be delivered.
In case you want to try it, I'm using 25 mg mlm pregnenolone from nutricology. The transdermal is life-flo either 15 or 30 mgs. The new sr preg I'm going to try is McPherson ultra micronized sr 50 mgs. I hope I hit a sweet spot with that.