I would leave my 11yo asleep if I told her the night before. She is very mature and responsible. I have left her to go grocery shopping, etc.
I would not leave my two younger dc with her for more than 10-15 minutes, though, as they are too close in age to really listen to her or take instruction from her.
I have a 15yo ds that I do leave all three youngers with for date night, errands, etc. He and my 11yo know what to do in case of emergency.
One night, a date night, my dh and I got a call from our 15yo that there was a man in our driveway who ran up in the woods. The kids saw him twice. W live on the side of a mountain with nothing around us, so no reason for him to be there. He had already called 911, the doors were locked, and we went straight home. It was unnerving to see sheriff's cars circling our property and in our driveway when we got home, but he did the right thing. It was a long time before I left them again after that.