what triggers someone to randomly take a quick or deep breath while breathing normally?

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I will be sitting down or laying down and at random will find myself either taking a deep breath out of nowhere or a short, quick inhale. In my mind I imagine it is like my lungs are keeping a normal rhythm and then just decide to either take a big gulp of inhale or exhale, etc. and then goes back to normal. Nothing medically alarming…just wondering why that happens and the physiology behind why that happen. Thanks in advance!

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