It doesn't make you drowsy but it helps calm your brain and eases anxiety to let you sleep. You may still wake up, but you will be able to slip back to sleep. Wake up rested. Seems to have an effect of about 6-8 hours so take accordingly.
I believe I found it in The Modern Herbal Dispensatory by Thomas Easley and Steven Horne.
I, several members of my family, as well as several friends, have all had great success with it. A couple of whom sometimes have quite serious problems with sleeping and this tincture (or tea) has helped where nothing else would, short of strong prescription medicine.
1-2 dropper before bed, depending on body weight.
Both California Poppy and Skullcap are sedatives so do not mix with other, similar, medication.