There are a number of ideas about the cause of migraine headaches ranging from theories involving a genetic component to dietary triggers and weather changes. While the burgeoning field of migraine research continues to shed light on the numerous contributing factors, one point is clear: Migraine is a result of a hypersensitized trigeminal nerve.
Now, I know what you're thinking. "A hypersensitized WHAT?!?!" A hypersensitized trigeminal nerve. It's a nerve in your brain that has two divisions. The first is a motor division that controls the muscles of mastication. These are the muscles involved in chewing, namely the temporalis, masseters, and lateral pterygoids. The second division is a sensory division. Think of it as a sensory map of your head and face. Following me so far?
Picture the trigeminal nerve as a bucket. Throughout the day, your bucket is filled with negative input. This can be in the form of physical pain, mental stress or other negative input. The bucket fills throughout the day and when you sleep, the bucket should drain. Draining the bucket overnight allows you to wake up without pain.