Question

He doesn't shouldn't stay up so late​

Answer 1

Если нужен перевод то вот: Ему не следует так поздно ложиться спать.

А если что-то иное, то дополни.

Answer 2

The sentence "He doesn't shouldn't stay up so late" seems to have a double negative, which can make it a bit confusing. To clarify the meaning, you can rephrase it in a more straightforward way. Here are a couple of options:

1. He shouldn't stay up so late.
2. He should avoid staying up so late.

Both of these rephrasings communicate the idea that it's not a good idea for him to stay up late.