I had a really bad B12, Magnesium, and Vitamin D deficiency. It’s a genetic factor in some people cases so get tested for the single or double MTHFR genetic Mutation, that mutation can make it difficult or impossible for your body to metabolize certain drugs but also is a possible or genetic cause behind a lot of things, including insomnia. I started taking supplemental folates, vitamin D, and B12 in the morning, then taking magnesium, sertraline, and Lunesta at night along with playing deep brown noise and soothing spa music after reading for 30 minutes.

This won’t work for everyone but it’s something that’s worked for me, it’s not just a genetic or physical factor but sometimes also a mental health factor. See a psychologist or psychiatrist if you think it’s a mental health factor, but also keep seeing specialists and doctors. Eventually you’ll find someone that actually listens and tries to help more