The Sodium-Potassium pump is lopsided, typically from not getting enough potassium. Salt and potassium are used to open and close channels along muscle cell membrane, especially when contracting and relaxing are required. Imbalance of either of the salts leaves the ion gradient very close to signalling open or close along the muscle surface/ relax or contract, kind of like sitting on the fence about a decision. If you have enough Potassium you will typically not experience this, unless you are dealing with some exogenous electrical current, nerve damage, drug reaction, or the muscle being forced under tension involuntarily for too long.
What about quite significant twitches? My partner says I do a lot of twitching when we go to sleep – I am not aware that I am doing it even when I’m still somewhat awake. Now and then I’ll get the “big twitch” where I feel like I’ve fallen and landed heavily, but I understand that’s quite different and everyone gets it.
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