I thinks it because they are inside our house and are nice and warm and very comfy.
They get put outside on an evening and when no body at home but as soon as we come home and the front doors open they come in and chill out.
They do play and eat and then sleep.
Also our little kittens a bit simples, hes cross eyed, cant chew as hes got no teeth, he screams so loudly at us , he has to have liqiud cat feed as he cant chew ,and when he tries to lap it up he gets it alover his face and kitchen floor then he starts to drool after hes eaten.His balance also goes aswell.He was a ferral kitten but now he has a loving home with us .