Closed because it's the poop room.

Human monkey brains like enclosed spaces for security especially when we are the most vulnerable. Closed doors gives you the impression of safety.
And on top of that I have a window in the bathroom that's not have any balckout curtains on it. So it needs to be closed, else I would wake with the sun. And that's not a desired outcome.

Open, because there's a window in there and it's the only way to generate a through breeze if I have it open and the one in the bedroom. If I were to keep the bedroom door open the dog paces back and forth all night.

Closed.

Your average closet monster is restricted by the size of the closet. Can you imagine what size closet monster could lurk in an ensuite?

I never close the door because it doesn't matter to me. Boring answer yep.

I prefer to keep it open to get airflow circulating through this room that sees a lot of humidity, but my wife prefers it closed (along with the closet) due to monsters so it's usually closed unless I use it last before bed and slyly keep it cracked open. No monster attacks to report as of yet.

In my home, everyone puts the seat down, then flushes. The seat stays down at all times when not in use.

The bathroom off our bedroom, has the cats' litterbox in its closet. I cange the litter 2-3x a week, and always wash the bathroom down at the same time. We also have an air purifier right outside the door.

So, we keep the bathroom door open unless someone is using it. That bathroom is reliably the cleanest room in the house at all times.

Married for 30 yrs. We never shut the bathroom door. Period

I keep doors open so that there is free airflow. I live in a high humidity area.

I don’t like open doors directly connected to where I’m sleeping, unless I’m just taking an afternoon nap and someone else is awake in the house. We keep the bathroom door closed enough to just before the doorknob latches, so it isn’t noisy opens/closes the door when using the bathroom in the middle of the night.

I keep it closed because I like my bedroom to be as dark as possible when I sleep.

I position night lights at key locations through out my house so one can move around at night and not have to turn on lights, which can suck when you are in the wakening process. Also it makes it easier for guests to move around the house.

So, i have a night light in each of my bathrooms, one in a corner of my kitchen etc.

Our washroom is connected to the main hallway, where it goes to an open kitchen and living room. There's a door to our bedroom there, making a loop. Our cats get the zoomies and run around and around that loop, making for some good cat crazy entertainment.

closed for less sunlight through the bathroom windows that reflect off my mirror out into the room

Closed. Mostly because there’s no shades on the bathroom windows and blackout curtains on the bedroom windows (no one lives behind me), so it stays darker with the door closed.

Closed mostly to prevent light coming in and waking me up early. Haven’t thought about the poopmosphere

Open. I have a Samoyed and he likes to lay on the tile floor. also helps there is a vent on the lower half of the wall that blows over his chest when he's on his back.

Closed, otherwise the humidity gets into the bedroom

i live alone in a two bed and I never close any doors.

I don't even lock my doors when I leave most of the time.

Closed because it is accessible from two sides and the other people enter from not the bedroom.

Normally closed. Simply because I like doors closed in general.

A second reason is sometimes that I like to have it really dark in the night, but sometimes light comes in through the bathroom window.

In my last apartment, the bedroom that I slept in had a sort of "open floor" layout to it, so the bathroom was kind of just there on one side, there was no door to close. It was kind of nice, I just kept an air purifier on that side of the room.

Open. It has no windows, and I don't want moisture to turn into mould .

By "bathroom", I mean ensuite. It has no bath. It's just a shower and a sink.

My master bathroom (attached only to my bedroom) door generally stays open partly because the toilet has its own micro-room with its own door that can stay shut, partly because the dog likes lying on the cool tile, and partly because the HVAC system is more efficient that way.

I also have a bathroom between two rooms. My office and kids’ room share one. The office door stays shut all the time. The kids’ room generally stays open for a little additional light, to reduce accidents because they were sleepily fumbling with the door and because kids are inherently kinda lazy about things like closing doors.

Closed. It's a double-master apartment, and activity from the other bathroom gets echoed and amplified through my bathroom.

Closed, the shower drips at night when the heater makes more hot water. That's loud.

I used to live in a flat like that. When I did, I used to have it open because I needed the fan noise to sleep.

1/3 open. It blocks the light that way but let's air circulate from the central air registers in there. Otherwise the bedroom gets hot.

The door to the tiny WC stays closed, but the rest of my bathroom (sink/tub/shower) doesn't even have a door.

Keep the toilet out of your line of sight when you're in bed, that's just bad vibes.

For airflow, open during the day and closed at night. It should have an exhaust fan, try to make sure smelly air is getting sent anywhere but your bedroom.

Open because we don't want the pipes to freeze.

Close because the toilet is #Satan's place.

When I slept in the room with the ensuite, we didn't care when we slept. Mean don't think either of use dropped deuces (#2) close to sleep time there, we also have 2 other toilets so that bls.

Basically my thought is, if someone can smell it less if I pooped elsewhere in the place, do it that spot. Cause I don't like smelling poop so assume others do not care to either.

Course I have my own issues but still assume that's a good rule to live by. Man when a date had a curtain over the bathroom doorway and not a solid (well semi solid there mostly empty in the middle) door I couldn't relieve myself. Mean enough making out maybe I could tinkle but that's about it.

Open. The midnight sprint to the toilet needs no obstacles

Only closed while showering or if I dropped a good one. The rest of the time I didn’t notice. I suppose it depends on the layout of your bedroom how much it bothers you.

At this house we keep it open- it has a nice window that i like and there's a dog gate in the doorway. In the last house we kept it closed to keep the cats from peeing on the rug.

During the day open but for sleep I usually close it because we have lights in there that can be annoying

I close my bathroom and my bedroom door. Makes it feel more like a cocoon.

I keep mine usually half opened or half closed... Really depends on who you ask though

Open. In fact I could remove the door. My bathroom doesn't stink and if anything is making noise in there then it needs maintenance anyway.

That being said, the doorknob has become a home for trash and recycling bags for the bedroom, so I guess that's handy.