I have a five-month-old Lhaso Apso pup that used to sleep, no bother, at night. Now he just cries most of the night.

Have you taken him to the vet? He could be in pain.

Do you crate him at night?

Has anything changed in his life or in his surroundings?

(I edited your post to it is not texting and so it could be read easily. Please write in good English in the future.)