Maybe the B12 played a part in it, but I experienced not only severe sleep issues but also anxiety, suicidal depression, muscle symptoms, palpitations, and tension in my head. I also developed really dry eyes that hurt when exposed to the wind.
I began to stay sleep 5+ hours somewhat consistently after about three months then the insomnia came back in full swing, along with some muscle tightness, after eating a lot of that nut bread and I’m waking up after 3 hours again and can’t go back to sleep. This has so far lasted more than a week.
I hope you’ll only get better. Do you monitor what you eat?