I think this works best for me of all the others I've tried. Most longer acting sleep aids, make groggy or I can't get out of bed...Sonata has a very short acting period of 4 hours. So if I toss and turn for hours I can still get up and take it because I have enough time. It's definitely saved me from a lot of sleep deprived misery and I am thankful for that. I did experience some memory loss problems, usually because I didn't go straight to bed and lay down. This pill hit me in 5 minutes once....unbelievable. I've never been ab le to fall asleep in under an hour.