I wrote "all the night" and it says wrong, but I think natten refers to "the night".
Just a culture question... Is this true in Sweden? Are there lots of 24 hour bars, and is drinking a big part of the culture as it is in places like Germany?
Short answer: Nej.
Here in Göteborg bars close early at like 1 AM, some 'clubs' stay open till 4. Alcohol is too expensive here anyway :p
Some adjectives don’t need the den/det article and ”hel” is one of them.
What part of speech is öppna in this sentence? An adverb or an adjective or is it the infinitive of the verb, 'att oppna'. If the subject were an ett noun, singular, would the sentence read, Huset är öppet..., but if plural, definite, Husen är oppna... ?