Sharing this in case it helps anyone else
My almost 2yo DD has never slept well, 1+ night wakings and early mornings. Last month she started waking with what seemed like nightmares, so we got her a nightlight. She instantly started sleeping through the night AND sleeps until 7:30am, when she used to wake up between 5:30 and 6:30. We got a basic Lindam nightlight off Amazon.