Depends on the outside temperature.

If it's warm outside, all my flat's windows are open and for better airflow I leave all doors open, too.

If it's cold outside, everything is closed to retain the heat in my bedroom.

Usually closed because I like to be naked, but I would prefer it open for the pets to come and go as they please.

Closed. My housemate's cats sometimes pounce onto my bed and wake me up.

The closed door also dampens outside noise.

Closed, i don't like mosquitoes.

Both, because I'm lazy. Whatever the door is at is how it will stay.

Open for air circulation. My fiancee and I live in a too-small, old apartment which, naturally, has trash airflow. Getting the AC to decently reach the bedroom requires multiple fans.

Open because pets

I live on my own so all the doors in the flat are open all the time, even the bathroom ones.

Window open, door closed; window closed, door open. I do what I can to prevent unnecessary door slamming in the night caused by a draft from the window

Open. The decline of the political climate in this country since 2001 has made me fear for my safety since I was in middle school, so keeping the door open helps satisfy that part of my brain that's always in threat detection mode by allowing me to hear everything in the house from my bed.

Plus, I live alone. So pretty much every door is open all the time.

Cracked open so we can hear across the house to our kids room (also cracked open)… baby gates in front of both rooms to prevent the cats from disturbing our sleep lol

Closed, keeps the dogs in so they don't leave us a surprise.

Closed. Like to keep my room temperature like 10°C lower the rest of the house during the night

Closed because I’m afraid of the dark most times. My cats don’t care they run around the living room. Dog sleeps with me on the floor at the bed to protect me.

Open both for airflow and because we have animals that do not like to be restricted.

I want it closed, but the dog wants it open and his litter box is in the hallway. So, open it is.

I keep mine closed but not latched so the dogs can open it in the morning otherwise they sit outside and scratch and wake us up.

Open but I live alone in a small 1 bedroom apartment. Mostly so I can shuffle to the bathroom in the night if needed without needing to open the door

I don't have a door

Don't have a door but a stair. Don't need a door cause I'm the king of the castle

Open - just me and my husband here and it keeps the room cooler.

All depends on whether you live with other people or not. If others can be in the house making noise then door closed. If you live alone then it doesn’t matter.

Open when I was at my house. Closed as I'm renting an apartment now with several flatmates.