A tilted window is enough. Once a bat has mistaken your apartment for a cave, it simply flies in and wants to sleep through the day in it. Bats only become active at dusk or in the dark and go insect hunting at night.
Bat in the apartment: keep patience and calm
If you have a bat in the apartment, you should definitely stay calm. The animals like to hang on curtains or curtains and just wait peacefully for the day. At best, do not disturb the stray wild animal during the day and stay away from the appropriate room until the bat flies out by itself in the evening. To ensure this, however, you should open all the windows in the room shortly before dark. When the day-sleeping bat wakes up in the evening, it will fly out of its own accord and simply continue to hunt as if nothing had happened. Do not touch the visitor - this would scare the animal and can quickly result in a bite.
After the bat has slept in the apartment and flown out again in the evening, you should keep the windows closed for a few days so that the "mini vampire" does not come back and settles in your bedroom. Important: After the bat has departed, check whether it is still hiding somewhere in the room. So take a close look behind and under furniture and curtains.
Don't touch the bat
As already mentioned, you should not touch or disturb and scare the bat in the apartment. The animals feel massively disturbed by human touch and think that they are being attacked. As a rule, they then try to defend themselves with bites. Bats have sharp teeth that can hurt and sometimes even lead to illnesses and infections. If you need to touch a bat in an emergency, do so only with sturdy gloves and be careful not to injure the wild animal. A bat bite should be examined by a doctor for safety. Bats may transmit rabies, so be extra careful!
If in doubt, you can contact a veterinarian or conservation organization to help you help the bat.