When I was first getting into tarot in my teens, the book I was learning from said that you must have a new deck under your pillow for at least one night to get a better connection with the energies. I did do it! But now I think it's just superstition! I just hold and shuffle a new deck until I feel in some way connected. But you could try it out and see if you feel more connected under your pillow! But it's not needed until you want to experiment with it.
I remember someone in the past on AT tried different individual cards under their pillow and had amazing dreams relating to the energies to each card!
I also do it with stones and crystals. (In the pillowcase, under the pillow)I've done the same, and ditto on the vivid drams. I also bent some cards terribly, so then I stopped doing this. I do think you can connect with a deck doing this, as woowoo as it sounds, it's not totally crazy to think it could create a deep bond. (I know it does with pets, and they don't get placed under my pillow)
