Except for some crystals that are beneficial for sleep, such as Labradorite and Moonstone, it is not recommended to wear other crystals while sleeping. This is because crystals absorb negative energy throughout the day and need to be purified by placing them in a demagnetizing stone. Also, when sleeping, people enter a state of shallow consciousness, and their sensitivity increases. At this time, the energy of the crystal may become too strong, leading to an overstimulation of the nervous system, which can be detrimental to the body.