真夜中にトイレに行きたくなって目を覚ましたって英語でなんて言うの？

This is an informal way of explaining the situation in American English. This is an especially helpful sentence if someone asks you why you were up or awake in the middle of the night. "Bathroom" is the term that Americans use for where you urinate. I hope that this helps :)

"I woke up in the middle of the night to go to the bathroom." is a way of saying you woke up because you had to use the restroom during the night.

The first sentence would be appropriate if you woke up once and had to use the restroom. If it happened more than once, such as in the case of food poisoning or illness, the second sentence is more appropriate. The third sentence would be appropriate if you are talking to a doctor or other medical professional about a problem that keeps coming up.

"I woke up around midnight feeling like I needed to use the restroom." Around - sometime before or after 12 am, but very close that time. Restroom - another word for the bathroom, Water closet, latrine, toilet, etc. "I was awakened in the middle of the night, but the urge to use the restroom." Awakened - to wake up because of something, a sound, etc. Middle of the night - sometime between 11 pm and 5 am. Urge - felt the need to use the restroom.

Well, if you are sharing the story of your bodily functions with someone, you can easily use the informal word 'pee' when talking about urination!

"I woke up in the early hours to use the loo/lavatory." - This answer is a fairly formal way of saying "I woke up in the middle of the night because I needed to go to the restroom." 'Early hours' suggests it was the middle of the night. 'Loo' is an English slang term for toilet. In some parts of the UK it is considered more formal to use the word 'loo' or 'lavatory' when referring to the toilet. "I was disturbed in the middle of the night." - Again, this answer is a formal but more subtle way of saying that you needed to use the loo in the middle of the night.