Hi, Do you take B12 at night or in the day, or maybe divided doses? For the sleepiness I experience with B12, I thought of the following factors, and want to know if you've "fixed" the sleepiness issue if you've faced it, or changed your B12 timings? 1. Melatonin production 2. Low potassium and/or folate 3. Co-factor deficiencies? 4. Is the induced sleepiness a sign of healing?