Learn Swedish: God natt! Jag ska sova nu. - Good night! I am going to sleep now.

In Swedish, adjectives change depending on the noun they describe. Because natt (night) is an "en-word" (en natt), the adjective god stays in its base form. If it described an "ett-word", it would become gott.

Why is there no word for "to" between ska and sova?

The word ska (will / am going to) is a helper verb. In Swedish, helper verbs are followed directly by the infinitive (the basic dictionary form) of the next verb. You just say ska sova, without needing the Swedish word for "to" (att).

Does ska always mean "am going to"?

It means both "will" and "am going to". Swedish uses ska to talk about future plans or intentions. So Jag ska sova nu can mean either "I am going to sleep now" or "I will sleep now".

Do you pronounce the "d" in God natt?

In everyday spoken Swedish, the "d" in God is usually silent in common greetings. You will most often hear people say "go natt" instead of clearly pronouncing the "d".