What temperature do you keep your bedroom at night? (Also feel free to share a quick way to mentally convert Celsius to Fahrenheit, I guess we'll need it)
I'm born and raised in the US, so I grew up on Fahrenheit, but switched my phone to Celsius about 10 years ago because I wanted to better understand the scale and have stuck with it ever since. I really don't need to know the exact temperature when I check the weather, just an estimate of whether I should dress for "hot", "cold", or "mild". One of the "tricks" I heard early on was similar: 0°C is freezing. 10°C is cold. 20°C is comfortable. 30°C is warm/hot. 40°C is fucking hot.
It goes as low as 10°C / 50°F in winter. I've programmed the radiator valve to give some heat (14°C/57°F) before going to bed and waking up. We have 2 duvets with flannel sheets, and a fleece bedspread on top.
Today it's 17°C/63°F. Just one single duvet, time for regular cotton sheets, flannel ones are getting uncomfortably warm.
As soon as it's about 10°C outside we'll leave the window open all night. We have a large frame with a mosquito screen and live in a very peaceful neighborhood.
For summer, just a cotton sheet, that will probably be left down the feet most of the time.
On holiday with sometimes 30°C the whole night, we basically cannot sleep, the confortable limit for us is close to 26°C - but it's more related to humidity than temperature
If you think about the formula for converting, it's close to multiplying or dividing by 2. This step is off by about 10% (1.8/2=0.9). So converting from F to C, subtract 32, divide by 2, then add 10%.
For C to F, multiply by 2, subtract 10%, then add 32.
At typical temps, I've found this is usually within a degree, and easy to do in my head (and I have zero working memory).
~18C but I also like it much colder, but it hardly gets any colder in my bedroom because my partner is always freezing. In summer it's really hard for me, above 22C is uncomfortable.
Heating and cooling are expensive at our house so we generally let the temp do what it wants so long as it stays between 64F and 80F. The dehumidifier, though, tends to keep it in the upper end of that range during the summer.
Whatever temperature the apartment ends up at 🥲 My cat won't sleep with the windows closed (insane behavior), and I'm not running heat or air with them open.
My ideal is 68°F or around 20°C, but kitty gets whatever she wants.
In a country where thermostats and air conditioners and whatever in your house isn't really a norm. So like other answers here, just whatever temperature. And I adjust the amount of layers on my bed or that I'm wearing to accommodate. Hot summer nights are the worst.
It varies by season. In summer, typically 24 on 'dry' mode to pull out as much humidity as possible. In the winter, on nights that fall below 16 (Japanese homes have shit insulation), I'd set the heater to somewhere between 16-20 depending upon how cold I felt on that particular day. These days (spring), we're not using anything at night, really.
Whatever temperature the outside air is except in the summer when it gets obnoxiously hot and humid, at which point I put a cap of 25°C on the temperature.
So last night it started around 24° at nightfall and fell to 21° in the wee hours.