A gGood sSleep lLast nNight

Recently, I usually wake once or two timesice every night recently, but I didn't last night.

'once or twice' would be a more natural way of phrasing this

Maybe tThe reason ismight have been the room temperature.

We have centralized municipal heating in our neighborhood, so my house hais abroutnd 28 degrees Celsius.

In English, temperature is a state of being, so it uses "is"

I have been feeling a little hot, but I never cared about it.

You could also say "I never cared too much". This would probably be a more common way of expressing this feeling.

Last night, I opened my room window a little bit and slept with ithe window opening.

Changed to "it" because it would be more natural to avoid repeating "window" again.

I removed "room" because it's a bit redundant. We know from context which window you're talking about already.

I didn't expect I willould have such a good sleep.

Or, you could simply say "I didn't expect to have such a good sleep" and remove the repetition of "I".

I would like to go to sleep with the window opening again today.

I had a good sleep last night. (or: I slept well last night)

The original sentence is perfectly okay, but sounds informal or a little childish.

I usually wake one or two times every night recently (Lately, I've been waking up one or two times every night), but I didn't last night.

The use of "recently" at the end of the phrase sounds a little awkward.

We have centralized municipal heating in our neighborhood, and my house hasis at about 28 degrees Celsius.

It's typically not said that an object has so-and-so degrees, but that it is so-and-so degrees.

Last night, I opened my room window a little bit and slept with the window opening.

I didn't expect I willto have such a good sleep.

I would like to go to sleep with the window opening again today.