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One tic can qualify as a seizure, several in close proximity can be several individual seizures or if you feel one seizure has no specific ending as you have another they can be termed as a cluster.
There are a lot of causes of muscle cramps and spasms. Lack of magnesium or salt in your diet. They also occur after exercise, as your body relaxes and you fall asleep, massage, muscle soreness, stress etc. Personally, I wouldn't consider it as a seizure unless it occured in conjuction with other symptoms.
Myoclonus is nothing compared to a TC or, what I used to have, simple partial motor seizures that left me twisted like a pretzel on the ground, conscious, but unable to move. However, after having the tumor that was responsible for my seizures partially removed, I developed what I eventually, after reading posts on this site, figured out was myoclonus. The bit of the tumor that the doctors were able to remove was near the part of the brain that controls the lower right leg. After my brain healed and settled back down, I no longer had TC's or SP's, but I started to have the myoclonus, I guess because of scar tissue. Of course it's not as bad as the other seizures, but some nights while trying to sleep my foot would flap violently up and down several times. If it only happened once or twice, no big deal, but often it happened every few minutes for hours at a time. There were nights when I just wanted to cut my foot off. Fortunately, I discovered accidentally that vitamin D greatly reduces the myoclonus. I would think it was just a coincidence, but at about that time I read on this site that low vitamin D can contribute to seizure activity, or at least lower seizure threshold.
So, long answer a bit shorter, a bit of myoclonus, no biggie; myoclonus all night, interfering with sleep, problematic.
Since being on medication my major events have somewhat ceased but I intuitively know when I am getting an 'echo' of what might have been an event or the beginning of an event if I was not on the medication. I have been told to put these events into my diary, however minor, especially if I did not experience them pre medication times. I have always been concious when having an nocturnal seizure (I don't have day time seizures) so I know the slightest inclination of when one is about to start even though, whilst on medication, they are somewhat subdued or do not develop further.