<human>: Summarize the given text in a few sentences.

I have a fantastic 3 1/2 yo daughter, who is almost unable to sleep through the night without wetting her bed. We have a one month old son, but the problem started even before the pregnancy. 

We do not want to go back to night diapers, we feel this would be a regression, but nothing seems to work: we put the potty beside her bed, we make her go to the loo two or three times before going to bed, we reduced drinking in the late evening. She almost always (4-5 times a week) wakes up wet crying in the middle of the night, sometimes even twice during the same night. It sometimes even happens during nap time at the pre-school she goes to. We try not to make a big fuss about it, but the thing starts to become quite tiring - more so now that the newborn is also crying many times during the night. 

One amazing fact is that she did not wet her bed for an entire week, when the little brother first came back from the hospital with mum.

The atmosphere at home is quite relaxed, I would say. She is a very bright toddler who is raised to be trilingual (we live in Europe). Her way to cope with the arrival of the little brother is to be very caring and tender: lot of kisses, and hugs. She is social and, albeit we live abroad, she has a very active relationship with the two grandmothers (that come quite often to visit for long periods of time). 

Any advice about how to make the situation evolve?
<bot>: 3 1/2 yo daughter wets bed almost every night, and we do not want to go back to diapers. Need some advice from experience.