When I was a teenager, I once snuck out of the house at night and didn't get back home until 4 am. When I got back my mom was waiting for and had been worried sick all night.
Did you get in much trouble? I was allowed to kind of run wild, so never had any issues with staying out till sunrise. 
Not huge trouble. I was generally a pretty good kid, and it wasn't like I had gone out drinking as I have never enjoyed the taste of alcohol. She told me I just needed to be honest with her and check in when I was going to be out late. I still felt bad about it worrying her.
It's sweet that she was waiting up for you. 