Gute Nacht is the neutral, standard bedtime phrase that works in any situation. Schlaf gut ('sleep well') is warmer and more personal - reserved for people you actually know.
Ways to say it
Gute Nacht, schlaf gut!
Good night, sleep well!
Schlaf gut und träum was Schönes.
Sleep well and dream something nice.
Süße Träume, bis morgen!
Sweet dreams, see you tomorrow!
Why Schlaf Gut Can Sound Too Casual for Colleagues
Schlaf gut uses the informal du command form, which only fits someone you'd already address as du. Saying it to a colleague you address formally would clash with the rest of how you speak to them - Gute Nacht stays safe in exactly that situation.
What Changes for Formal Sie
Schlaf gut becomes Schlafen Sie gut for someone you address formally - same sentiment, different verb form. Gute Nacht itself never changes; it's already neutral enough to work either way.
Frequently Asked Questions
How many ways are there to say 'Good Night' in German?+
3 common ways, each suited to a different level of warmth - see the table above for exactly when to use each one.
Which one should I default to if I'm not sure?+
Gute Nacht is the safest, most neutral choice - save Schlaf gut for people you'd already address informally as du.
How do I say 'sleep well' formally?+
Schlafen Sie gut - the formal Sie version of Schlaf gut, used the same way but for someone you don't address as du.
How do I practice these three phrases?+
Select the phrases you want, then use the bar at the bottom to start Flashcards, Multiple Choice, or a Final Test.
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Practice tips
- ✓Tap play to hear each phrase before you try saying it yourself.
- ✓Notice which options are formal and which are informal before you use them.
- ✓Practice the example sentence, not just the phrase on its own — that's how it's actually used.