A foreign exchange hedge (also called a FOREX hedge) is a method used by companies to eliminate or hedge their foreign exchange risk resulting from transactions in foreign currencies (see foreign exchange derivative). This is done using either the cash flow hedge or the fair value method.
Sleeping on your face puts the top cat at the highest point on the bed, the primo location for keeping watch over everyone. Your more submissive kitty will probably sleep at the foot of the bed or in her own kitty bed in the corner of the room.
Cats roll over on their backs for a variety of reasons: if your cat flops down in front of you and rolls over on his back for a belly skritch, it's a sign of his complete trust in you that you won't ever hurt him. Other times, he wants to play. If the cat is female and in heat, it's a form of foreplay.