So tired but cant seem to sleep

I dont know if its from the excitment but cant seem to fall asleep. Definitely feeling a little more tired than usual but having a hard getting to sleeping and when i do i am waking up 3 times a night. I am also waking up at the crack of dawn! Anyone else like this? Tomorrow I will be 5 weeks and i had found out last Monday. Thinking its just from being so excited about all of this and thinking of everything to come.