Ladybird on window

This morning again there was sitting/sleeping a ladybird on my window.
Don't know why they like to sit there, maybe its a nice place having a view inside & outside my house.
First it looked like sleeping, but as I moved around with my cam, he opened his red wing a little, so I could see a little of his underwing, with which he actually flies. the red wing is more a protection for the black-wing under.
Its perfectly folded there. but opens up when going off to flight.