I do basically the same as others. I used to have just an audio baby monitor but I don't like to hear them cry and not know the reason so I got a video baby monitor so I could see what they were doing. It really helps as I don't have to go in the room unless I can see they need something. If I hear or see them awake and they don't go back to bed(which is very rare), I go and get them. I wouldn't keep my own child in a playpen for that long if they were awake so I don't do that. Thankfully I have children who sleep 2 to 2.5 hours!

I once had a child climb out of her playpen!! I didn't have the video monitor at that time so I'm glad I went back in and checked! She's never done that again thank goodness