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Maybe you're dehydrated. That's what my voice teacher says anyways...water is so essential to everything. Try that and the sleeping. Not only 8 hours, but keep to the same schedule...even on weekends, which I know sucks. But if you go to bed at 12 one night go to bed at 12 every night. Don't do 10 one night and 3 the next etc etc. You circadian rhythms get messed up.
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