Imbalance in the function of Cranial Nerves is known to arise from tension or compression placed on them by changing alignment of the bones of the skull. By simply reorganizing the relationship of the associated Cranial bones, normal nerve function quickly resumes, and the experience of being balanced and centered ensues. Chronic misalignment is usually associated with joints between the bones than can become stuck and it can take some focused work to unjam them. However, the type of imbalance that we all experience, sometimes just calling it "a bad day" can be approached much more generally and often with the simple exercise I am about to present. This type of imbalance can result from how we slept, to our physical reactions to any type of stress, from trauma (even minor injuries) and can last quite a while before our body figures out how to self correct it.
The technique has its roots in Traditional Chinese Medicine (Gall Bladder Meridian) and Applied Kinesiology. I use it as a sort of first aid kit for working with structural imbalances when I don't have the time / inclination to dig deeply into the origins of an issue.
Laying down face up with knees bent:
1) Behind the knee is a little horizontal muscle called Popliteus. If you gently get your fingers into the void behind the knee, you will feel this muscle. Check both sides. One should feel much tighter than the other. Rub both deeply, but gently, paying special attention to the side that is tight. (In massage this area is considered high risk, so don't go poking deep in there, but spend a few minutes seeing if can get it to unwind).
2) At the front of the shoulder is a muscle called Anterior Deltiod. Repeat as above. A simple technique to get a muscle to relax is to compress the fibers along its length.
3) Lightly tap around the ear several times.
4) Repeat 1 - 3 several times. The Gall Bladder Meridian Energy moves down the outside of the body, so it is nice to stroke down the sides of the body, but you should start with the knees and work north.
My guess as to how this works is that these particular muscles have strong links to balance, and that by reseting their tension, it takes tension off of the bones of the skull. The tapping then helps reset the cranial alignment. There are many variants and embellishments of this technique, but this basic version works pretty effectively. Let me know how you like it.