change in sleep habits

I rescued a 2 yr.old female maltese mix. Have had her for about 5 months. She is crate trained and goes willingly when we head to bed. She sleeps in our room. For the past 3 days/nights she has been sleeping a good bit during the day (she does not want to play with toys) and at night she is whining and keeping us awake. Any suggestions? Thanks.

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