Learn Spanish (Spain): ¡Ya está bien de ruido! Son las tres de la mañana. - That's enough noise! It's three in the morning.

Ya está bien de is a common idiom in Spain used to show exasperation or annoyance. It translates directly to "That's enough [something]!" or "Enough with the [something]!". It is a very natural, conversational alternative to Basta ya de.

Could I say Es suficiente ruido instead?

Grammatically yes, but a native speaker wouldn't use it to express annoyance like this. When demanding that someone stop a bothersome action, Ya está bien de or Basta de are the culturally natural choices.

Why do we use de la mañana instead of por la mañana here?

When you attach the part of the day to a specific time on the clock, you must use de, like las tres de la mañana. You use por when talking about a part of the day generally without an exact hour, for example, Siempre hay ruido por la mañana (There is always noise in the morning).

Why is it Son las tres rather than Es las tres?

In Spanish, hours are plural feminine nouns (referring to the hidden word horas). Since three is more than one, the verb must be plural (son). You only use the singular es for one o'clock (Es la una).