How long does your baby sleep?

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Aurora is 18 weeks old and doesn't goto sleep till around 11pm sleeps to 3 am eats then sleeps till 7am eats goes back to sleep and sleeps to 12pm. Then she's up till around 4 pm and usually cat naps a bit off and on but is usually awake most of the time after that. Does that seem like a crazy sleep schedule to anyone else? How long are y'alls May babies sleeping?