It really is getting to be a habit. I searched back through all of my photos and found one of Huey, my dwarf hamster, in my parents' bed (while my mother was on holiday - much to her consternation). My dad posted it on Facebook, which makes him complicit. This was about five or six years ago.
Then, probably around the same time, my cat Tig, in my bed in Swords. This was just after I had moved from Galway, and she couldn't stay in the rest of the house as my housemate's cat would attack her. She wasn't the best "bed cat" as she had a horrible habit of sleeping on my legs which was really annoying.
And finally, here is my Lily, posing under my new quilt cover that I bought at the weekend. She only got to stay a short while as she sleeps downstairs in her own bed, but it was cute while it lasted. I had to scoop her up and carry her downstairs as she apparently had no intention of ever getting up.
I have to say, as far as actual sleep goes, I much prefer them all being in their own beds, however photogenic they might be. (future pets beware)