In this article by Naha for Of the Wolves – she sheds some light on the science behind Crystal Healing and gives suggestions for ways to use crystals and stones during the hours that you’re asleep.
“If you experience nightmares or fear during sleep, place a Chrysoprase under your pillow or by your bed.
You can also place four pieces of selenite, hematite, or quartz at the four corners of your bed, creating a protective grid.”