Senior cat. Rescue. Mine is a happy little 20 year old chap (got him 4 year ago) and sleeps all day every day. While also being super affectionate and purry.
We can leave him during the day and he is absolutely fine as long as we shower him with affection in the evening (which is no hardship. He is sat next to me on the bed right now, purring away, with his paws on my stomach).