STIGZ, we had a mouse in the living room - or evidence of a mouse - a few months ago. Traps down in various places. No mouse caught and now no evidence of mouse.
So either the cat had it (most likely culprit for brining live mouse in the house in the first place) or it escaped.
Splendide, I had never heard of or witnessed this much talked about sleep regression until I found Mumsnet. I do not recall any of my children regressing in their sleep. Slowly, gradually, they slept better over time. Growth spurts (when breastfeeding), yes, they definitely happen. But evidently the sleep regression thing is not universal.