Looks like you got 2 really good ideas to work with Jen. The bible says Spirits will always roam the earth and I believe it because we have someone/something that opens our kitchen cabinet door while we are sitting near it in the den. It happens often. It opens and stays about 2 seconds and slams shut. We don't even try to figure it out.
When I was little, my Dad told me that only the GOOD spirits are allowed to come back and the only reason they do is to watch over the ones they love and make sure they stay as well as possible and keep them from geting boo boos. It worked. I slept very well knowing that nothing could harm me because I had secrets spirit watching over me. He said when I heard noises, it might be them giggling or going through our toys to make sure there was nothing sharp or rough in them that could hurt us.
He also told me that the dogs will bark to let the spirits know if anything unusual happens, so if I heard the dogs in the middle of the night, not to worry, the spirits would take care of it for us.
Here's the funny part. He said if we heard noises coming from Mom's nd Dad's room, do not come to see what it was, it was just the spirits tickling their noses with some of the bird feathers. They only did that to the adults. (wonder why my mother snickered so hard at that one???)
Best wishes...maybe you could use all 3 ideas.