"Пусть идёт, он должен больше спать."

Translation: Let him go, he should sleep more.

[mayvereen]

Why "Let him go, he needs more sleep." is wrong?

[RomanRussian]

He needs - ему нужно/надо

[mayvereen]

But one of the correct answer per Duolingo is "...he needs to sleep more."

[RomanRussian]

"Должен", IMHO, is closer to must/should/have to

[GregoryCasteel]

So why does Duo accept, "He needs to get more sleep," but not, "He needs more sleep"?

[MattinMaverick]

Let me sleep! = Пусть я спать! . Am I Right?

[AndyPyrope]

If it follows the same structure as "Let him sleep," I'm assuming it should be "Пусть сплю!"

[dfggh4]

I wouldn't think so. You don't say "let I sleep" in english, either.

Google translate says "дай мне поспать". So you would need to use "me" in dative.

[Alon345527]

Can больше be replaced with много?

[Monica845117]

No. Много means "a lot" - there is no comparison being drawn in that case.