Im having brain zaps when falling asleep. an electrical feeling that runs from my head to my body jolting me awake not on any depression medication ?

Good question: No definitive answer to this excellent question. It appears that brain zaps may be associated with alterations of neurotransmitters like serotonin or gabapentin in ght brain. This issue is poorly understood. Here is a great article: https://mentalhealthdaily.com/2014/11/29/brain-zaps-causes-treatments-for-electrical-shock-sensations/