What does it mean when a guinea pig lays flat?

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If your guinea pig is lying on it's side it usually means that it is sleeping. Since guinea pigs can't close their eyes for more then ten minutes, you can tell if its sleeping when it lays on it's side and is poking it's leg out. If the guinea pig is sleeping a lot and not eating then the room it is in is too for it and you should probably move it's cage to a colder room in the house.