Piggle does this a lot, I've never seen her lie down properly or close her eyes, or sleep for any length of time- she power naps for a few minutes and kind of switches off with her eyes open then starts leaping about again. Nobody likes to share a pigloo with her because she wont settle down, and the other piggies all like their zonked-out chookened chillaxed sleepy time... she runs round all night tipping any sleepy piggies and their furniture upside down!