Could be a lot of factors: age, bodyweight, meds one takes etc etc. Maybe try working with Calms Forte' only. I know when I started with it years ago, I talked to Hylands about it and they said it's their #1 selling product. Probably 15 yrs ago or more I had bought some melatonin and I don't remember if it was 3mg or 1mg but I remember how groggy I was and never took it again for a lot of years until this low dose came to me via Dr. Eric Braverman of LifeExtension.