Brain lightning

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Prehaps the only way i can explain it.Occasionally, maybe a few times a month, usually when im trying to get to sleep i get what feels like a bolt of lightning in my head, it usually happens twice, the first one then a second about 10-20 seconds later, really strange.

I don't know about lightning bolts, but body twitches and jerks while drifting into sleep are very common, as also are brief little dreams.