I have been experiencing episodes of involuntary shuddering. It occurs in the evening when I am resting, and descends along my torso to my legs. It varies in strength and last only a few seconds, but occurs repeatedly. It is not like the involuntary jerking that can occur when going to sleep, being more of a wave-like shudder. I can't find any information on muscle movements that sound like what I am experiencing. My father died of Parkinson's Disease which causes some concern, but this does not seem to resemble any of the symptoms.
Does anyone have any idea what the cause might be?
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