Morning Headaches and Migraines

Sleep breathing disorders and uncontrolled bruxism (clenching and grinding) commonly result in morning headaches. Why?

It is hypothesized that one of the bodily mechanisms to compensate from obstructive of the airway is movement of the mandible (lower jaw) to increase patency of the airway. In doing so, your jaw and muscles of mastication are in constant use throughout the night, resulting in soreness of the jaw and radiating pain to the forehead, behind the eyes, and even the back of the neck.

Individuals that have true blockages of the airway (hypopneas, and apneas) experience oxygen desaturation  (loss of oxygen) of their bloodstream which can result in morning headaches.