Still wide awake

My little girl is still wide awake. She is been playing with Tomas Train and building up the blocks. She is easy to do things own her own. Really pretty smart little kid. She would get frustrated if she can't do it but she won't stop also if she can't succeed. I might give her milk later since it's getting late now and she needed to go to sleep and I needed to head to bed soon as well so we get up early in the morning together because I don't want her do things without me knowing it. It is really dangerous of her waking up alone that no one's watching.