Bat in my shower

Date of Observation
Sighting Details
Do you know what species you observed?

Small, 10 cm, black bat in my shower and sauna room.. I was surprised and thought it was a mad flying bird...  It was hot so the outside Door was open during the night.. 

What did you observe?
How many bats did you see?
1
How did you identify them
Visually Identified Bat