Hi there and welcome to Just answer!! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
These episodes are probably associated with a type of seizure. This could be caused by Feline Hyperesthesia or Epilepsy. This is not necessarily serious unless these episodes last a long time. With this, there is a risk of permanent brain damage.
For now, Give Kero benadryl at 1 mg per pound of his weight every 12 hrs. This will make him drowsy which may stop these episodes. then be sure to take him to your vet first thing Monday morning to know for sure what is causing these. If the episodes last longer than 10 minutes, take him to the Er vet....
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Good Luck! Sincerely, XXXXX XXXXX