Night Visitor

I hear him at night standing at my window.
He is listening at the window,
At my sleeping.
Sometimes I saw in my sleep
And sometimes I yawn.
I can hear him walking up to the house
And hope he is harmless.
He's been doing it ever since I moved here.
I've learned to sleep through his visits.
So far he's visits have been harmless
But if one day he has enough of listening to me sleeping,
And what if he is wanting to come in
And wanting more?