Bat in the bedroom

I went into the bedroom at around 7:30 this evening to find a bat circling. I am pretty sure it was not a pippistrelle by the way it flew and the wingspan so I am guessing it was probably a long eared. I was surprised how long it took to exit by the window I opened despite flying right by the window several times. The mystery is how it got into the bedroom, although the door was open so it could have entered the house in another room and then flown into the bedroom. I will check the attic above the bedroom to see if there is any sign of long eared roosting there.