"Cats are known to sleep almost anywhere and need plenty of sleep to allow their energy reserves to be replenished," said Maggie Roberts, Cats Protection's Director of Veterinary Services. This allows them to hunt whenever they detect prey and not wait until they are hungry. However, they are light sleepers and tend to wake at the slightest touch or sound - hence the expression cat nap. This is an important survival mechanism as the ability to wake and become alert quickly helps them escape daytime predators." Owned by Coreen Haynes Picture: Cats Protection / Rex Features

Credit : Cats Protection / Rex Features