I started taking the combo of malic acid/magnesium about 3 weeks ago and I was thinking about it this morning. I'm finding I'm getting about 5 hours at a stretch without waking. That's amazing because it used to go hour by hour for me. I take the combo and an additional 500 mg. magnesium oxide (that keeps me regular) around 9 PM and then bed around l0. I read Shirl's posts on this for such a long time and decided to give it a shot.