Baby awake at night..

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Any advice? She sleeps most of the day up all night..she's 3 weeks old and starting at 1am she's wide awake and asking to nurse every 30 min to an hour!! My nipples are gonna fall off, they are so sore even air blowing on them is painful..not to mention I'm getting no sleep. Any tips? Does this behavior start to taper off at a certain point?