So our mini Schnauzer has started playing up in the night. She’s nearly 18 months now and has always slept in the kitchen in her basket. The last week she has started howling and barking, usually starting about 1am. I let her out but she doesn’t really want that, she makes it quite clear that what she wants is to be with us! She tries to come upstairs and howls like mad when we don’t let her. Last night it went on for 2 hours - bloody exhausting and upsetting 
We wondered if she’s cold? She has a soft bed with a blanket but our kitchen does get cold at night. Or is it separation anxiety? She’s never had that before though.
Any ideas?