Give reason (The rate of breathing is the lowest when we sleep
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Some of it may be due to throat muscles relaxing. It may also be due to less movement of the rib cage during REM sleep. Whenever you're sleeping, your oxygen levels are lower and your carbon dioxide levels are higher because your level of breathing goes slightly down.
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During sleep, our physiological demands are reduced and temperature and blood pressure drop. As a result, the rate of breathing is the lowest when we sleep.
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