Learn Hardcore Spanish (Latin America): Se duerme temprano cada noche.

Here se is the impersonal se, which doesn’t refer to a specific person. It’s a way to say “people/one sleep” early every night. In English you might translate it as “You sleep early every night” or “One sleeps early every night.”

Is se duerme a reflexive verb or an impersonal construction?

It’s an impersonal construction, not reflexive. A reflexive would refer back to a specific subject doing something to itself (e.g. me duermo “I fall asleep”), whereas the impersonal se makes the subject generic or unspecified.

What is the implied subject in se duerme temprano cada noche?

There is no specific subject. The sentence means that “someone” or “people in general” go to sleep early every night.

How would you say “I go to sleep early every night” in Spanish if you want to mention the subject?

You could say “Me duermo temprano cada noche.” Here me is the reflexive pronoun for “I,” and me duermo means “I fall asleep.”

What’s the difference between dormir and dormirse?

Dormir means “to sleep,” focusing on the state of sleeping.
Dormirse is pronominal and means “to fall asleep,” focusing on the moment you start sleeping.

Why is temprano placed after se duerme?

In Spanish, adverbs of manner or time often follow the verb. Placing temprano after se duerme (“you sleep early”) is the most natural order.

Can I use todas las noches instead of cada noche? Is there any difference?

Yes. Todas las noches and cada noche both mean “every night.” They are interchangeable here, though todas las noches is slightly more emphatic.

Can cada noche go at the beginning of the sentence?

Yes, you can front it for emphasis: “Cada noche se duerme temprano.” The meaning stays the same, but you highlight the time frame (“Every night…”).