Indoor piggies?

who has indoor piggies? if so, have you ever covered their run up at night and spyed on them lol.... i covered their 6 x 2 run up gave them lots of food and spyed on them for 5 mins through the blanket covering them... they were so happy they loved it..... lots of popcorning and running about .... they loved it... never seen them so happy.. they were literally sprinting around their home - munching the food and generally being really happy... anyone else done this? i love them so much i am so happy when they are happy lol xx