When I'm doing anything but meditating or focusing (or have a migraine,) the silence can literally become deafeningly loud. In the absence of sound, my brain has decided that the sound I need to hear is a resonating ringng/whistling in my ears. It crescendos until I'll actually start moving around solely for the sake of making noise. If I didn't, I'm relatively certain that I'd start to panic and worry that I'd gone deaf. On the other hand, the ringing sound and control of it can be a useful focus to induce a light trance for meditation.
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