Leaves curl

nutrient-nitrogen overdose. I would not be afraid of the temperature. reduce the amount of nutrients

Over water or under watered is soil is dry water her if it is wet let her dry up

I had similar problems recently. Added AC and kept the temperature at a constant 75F (sorry). They perked right back up. Are you running CO2? Typically you can have higher temps with CO2. Looks good regardless.

they deal with temp differences in nature that doesnt mean its ideal :D

Nutrient overdose from feeding too much or too often, or both. Autos can usually get by just fine on half strength nutrients. Forget about the temps, they will not harm your plant, plants in nature/outdoors deal with huge temp differences between day and night and have been doing so for Millenia! Stick with superior photoperiod plants would be my advice, autos are pointless.

25C at night is not bad but 10C differential is a lot. ideally you should keep it under 5C between night and day. also when i said invest in an ac i meant you bring an ac to the room. you want to cool them when its 35C in the room not at lights off when everything is substantially cooler anyway.

My lights are fixed so I can only bring it into the air-conditioned room while they sleep. The temperature difference is about 10 degrees Celsius, is that really good?

N tox also i’d invest in an AC if thats your case