Richard
I suppose it is a personal matter. I've slept with the cards, but it didn't do anything.
I just put my infamous "personal" Spiral under my pillow for tonight. I have not had a problem with damage BUT i would only do this with a main stream affordanble deck.
I also often sleep with massage wands under my pillow because they are rounded and smooth, and they are designed with the intension to heal. Hmmmm, I do have a laborador massage wand. Hmmmm, maybe I will add that in the mix. (I believe sunstone and laborador are in the same family plus one more, that I will hopefully remember soon because that answer is filed in my brain...somewhere...
ETA: Moonstone, Sunstone & Laboradorite could symbolize the stars maybe?
For those of you who have slept with your decks, did you still respect it in the morning?