YOU SAID:

my girlfriend farts a lot when we're trying to fall asleep at night

INTO JAPANESE

私たちが夜寝ているとき私のガールフレンドはたくさんおならをする

BACK INTO ENGLISH

My girlfriend farts a lot when we sleep at night

INTO JAPANESE

夜寝ると私のガールフレンドはたくさんオナラ

BACK INTO ENGLISH

When I go to bed at night my girlfriend is a lot farts

INTO JAPANESE

私が夜寝るとき私のガールフレンドはオナラ

BACK INTO ENGLISH

My girlfriend is farts when I go to bed at night

INTO JAPANESE

夜寝ると彼女はオナラです

BACK INTO ENGLISH

When I go to bed at night she is a fart

INTO JAPANESE

私が夜寝るとき彼女はおならです

BACK INTO ENGLISH

She's a fart when I go to bed at night

INTO JAPANESE

私が夜寝るとき彼女はおならです

BACK INTO ENGLISH

She's a fart when I go to bed at night