Jest późno, dlatego czytam w sypialni.

Breakdown of Jest późno, dlatego czytam w sypialni.

ja
I
być
to be
w
in
czytać
to read
późno
late
sypialnia
the bedroom
dlatego
therefore
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Questions & Answers about Jest późno, dlatego czytam w sypialni.

Why is późno used here instead of późny?
Późno is an adverb meaning ‘late’ in terms of time (‘it’s late’). Późny is an adjective describing a noun (e.g. późny autobus ‘a late bus’). In impersonal expressions with jest you need the adverb: Jest późno = ‘It’s late.’
Why is there no subject like ono before jest in Jest późno?
Polish often uses an impersonal jest + adverb/noun construction to talk about time or weather without an explicit subject. It works like English “It is late,” but you drop the “it.” You simply say Jest późno.
What’s the difference between dlatego and dlaczego?
Dlatego means ‘therefore’ or ‘that’s why’ and introduces a consequence. Dlaczego means ‘why?’ and asks for a reason. Here you give the reason first (Jest późno), then use dlatego to show the result (czytam w sypialni).
Do I need a comma before dlatego?

Yes. When you join two independent clauses with connectors like dlatego, Polish grammar requires a comma:
Jest późno, dlatego czytam w sypialni.

Can I use other words instead of dlatego here?

Absolutely. Common alternatives:
Jest późno, więc czytam w sypialni. (więc is very common in speech)
Jest późno, zatem czytam w sypialni. (zatem is a bit more formal)

Why is sypialni in this form?
The preposition w (‘in’) takes the locative case when indicating location. The nominative sypialnia becomes sypialni in locative to mean ‘in the bedroom.’
Is the word order in dlatego czytam w sypialni flexible?

Dlatego usually precedes the verb, but you can rephrase for emphasis:
Czytam w sypialni dlatego, że jest późno.
Dlatego czytam w sypialni.
Other orders (e.g. Czytam dlatego w sypialni) sound awkward.

What’s the difference between dlatego and dlatego że?

Dlatego alone is a coordinating connector (‘therefore’). Dlatego że (often written dlatego, że) means ‘because’ and introduces a subordinate clause:
Czytam w sypialni, dlatego że jest późno.

Where is the stress in późno and sypialni?

Polish words are stressed on the penultimate (second-to-last) syllable:
późno (two syllables) → stress on póź: POOZH-no
sypialni (three syllables) → stress on pial: sy-PIAL-ni