This is a super typical age for a sleep regression! You are not alone, yes it is tiring, but you will get through it.
You can encourage more nursing during the day by going into a darkened room to lay down and have some quiet time to nurse (at this age babies often get super distracted while nursing during the day, which can lead to more night time nursing - it will not eliminate the night nursing entirely, but it may help some).
If you SAH you can nap when baby naps too, which will help you get the sleep you need.
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