What do cats do when their owners are away? There was one way to find out -"cat cams." Fifty house cats were given collar cameras that took a photo every 15 minutes. The results put a digital dent in some human theories about catnapping. Based on the photos, about 22 per cent of the cats' time was spent looking out of windows, 12 per cent was used to interact with other family pets and 8 per cent was spent climbing on chairs or kitty condos. Just 6 per cent of their hours were spent sleeping. Some 777 photos showed the cats looking at a TV, computer or DVDs 6 per cent of the time. Coming in at 5 per cent was playing with toys; eating or looking at food finished at 4 per cent.