Winter cat mode

Every cat Ive ever had had certain behaviours which they reserve for the winter. Lauire and I have always called it "winter cat mode". It was winter when we first got Pumpkin last year and he spent a lot of time lying in the empty bath. He stopped doing it earlier in the year and I assumed it was something he'd grown out of. I was obviously wrong though as it is clearly an example of Pumpkin being in "winter cat mode"! He started to lie in the bath again a week or so ago and is now regularly to be found relaxing there!