Sharp knife cutting like pain inside my right boob wakes me up in the morning. pain is associated with movement only and ends at once. not pregnant

Muscle and ribs: most likely, the pain is most likely related to your ribs and muscle,it coulkd be the way you sleep,or the bra you are wearing,or the position and the posture of your body while working. apply heat and take ibuprofen. not better see a doctor

Many possibilities : Could be: fluctuation of hormones caused by menstruation, a side effect of some birth control pills or some infertility treatments, a bra that doesn't fit, breast cysts, large breasts, which may be accompanied with neck, shoulder, or back pain or stress. Of continues please follow up with your primary care provider for a breast exam