More than likely they have decided to make the litterbox a new "resting" territory, however, keep a close eye on both of them. Sometimes cats will hang around the litterbox because they have a urinary infection/intestinal problem and feel the need to be close by in order to quickly go. Since it's both cats doing this, I have a gut feeling it's just a quirky thing they are going through.
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Smile, it will make them wonder what you are up to!

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