I absolutely cannot live without my OptiCalMag daily supplement! I'm going through peri-menopause, and have started waking up at around 3pm every morning. I then toss and turn and cannot get back to sleep for at least an hour. Subsequently, I'm then tired the whole of the next day. Since I've started taking my OptiCalMag before bedtime, I sleep right through and wake up refreshed! It's been such a lifesaver!