Stepping away any health issues (which could be a root cause of behavioral changes) I'd start looking at environmental changes. What is different for her?
Do you live in a rural area? Do you live in an area where you can hear your neighbors as they come and go? Are you using your heater/fire place (etc) for the first time this year? Are YOU sleeping well? Have you been ill (coughing, sneezing through the night)?
Try to think of anything in her world that has changed recently.
Hondo Von Dopplet L Bauernhof "Hondo"- GSD
Lilie's Tug McGraw "Tug" - Golden Retriever
Maggie - Mini Dachshund (Rescue)
Lonestar Pivo - Texas Blue Lacy
Ashe - Barn Cat
Katie / APHA