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They act as pillows for one another.

Joey finds that Jaspurr makes a superb pillow
Franny Syufy
Kittens will often play so hard that they simply flop where they are, and more likely than not, they will flop next to (or on top of) each other. There is no sight so endearing as two kittens curled up together for a nap. Their peaceful innocence can soften the heart of even the grumpiest curmudgeon, and the sight of that blissful moment will wash clean the slate of their previous misdoings.