Black Onyx activates the crown chakra and controls ones thought and the way of responding to world, It is again a very potent and powerful protection stone which keeps negativity at bay. It provides strength in the times like stress and depression.
Keeping a Black only under your pillow will provide peaceful and sound sleep. Just anoint little lavender oil and put it under your pillow to do the trick.
Disclaimer
Candles,Herbs,Crystals and essential oils are solely energy work and should not be completely substituted with conventional medicines and medical methods and it is advised to consult doctor if you have serious health issues