I have a neurological sleep problem (related to my Multiple sclerosis), and taurine helps me sleep! I read that it calms neurological activity, so I gave it a try. So glad I did. I take two pills (2,000 mg) an hour before bed. I can feel it working after about half an hour, and I totally crash as soon as I am in bed. But falling asleep is not why I take it--my problem is staying asleep. On my own, I wake up every 2-45 minutes. All night long! With Lunesta, I wake up every two hours for the first six hours, then every 20 minutes. With taurine plus Lunesta, I sleep six hours straight then go back to sleep for another hour. It is so nice! Taurine does not make me groggy in the morning like Ambien CR (which only makes me sleep for three hours anyway). I am also taking melatonin now, but I feel like melatonin helped a little, whereas taurine helped leaps and bounds. I have been taking it for two months or so, and I am trying to remember now if it took a few days to start working. I think it did. But I was only taking one pill to start with, so who knows. Give this stuff a try for sleep