What's flying near you?

I am having a really strange experience with a Blue tit, every morning around 5-5:30 it comes knocking on the bedroom window flapping up against the glass, it then spends the day moving from one room to the next and finally to the kitchen patio doors.
I have feeders (peanut, wild bird seed, and fat balls) hanging on my apple tree outside the kitchen and I have a great selection of finches, tits and sparrows feeding from them, then the starlings arrive and take over, also robin and blackbirds and pigeons feeds on the ground from the bits that fall out. The crows and jackdaws come in and attack the feeders as well.
But I can’t get over this blue tit that keeps flapping at the windows. At first I thought he was flying into the window but watching him he is not, he is flapping his wings and tapping his beak at the glass.
Anybody ever experience anything like this before ?