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Occasionally when I'm laying in bed, I get a sensation that I can only describe as my whole head shrinking while my surroundings grow larger around me, or vice versa. What causes this?

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Occasionally when I'm laying in bed, I get a sensation that I can only describe as my whole head shrinking while my surroundings grow larger around me, or vice versa. What causes this?	1
I put a dishwasher tablet in my bong and added hot water. It was effervescent. Why?	1