Why do I always have a burst of creative energy right before I’m about to go to sleep… my mind always races and I suddenly have all these ideas of the things I can accomplish - where was this energy during the day??

building silly apps for people, building ai machines for corpos

Embrace the darkness. It is your friend. 

In other-words, if you can't sleep, then work and take some extra time off in the day when you're naturally sleepy. In the book "why we sleep" Early birds and night Owls actually have two different genetic types.