I suffer from central sleep apnea, insomnia and when I can actually hit REM cycle, severe nightmares. I served one year in Iraq as a medic attached to an infantry unit - I've seen and done some shit. As a result, I basically have every hindrance to sleep possible. King Louis XIII filled the gap in my long list of remedies. I did everything else to treat my sleep - got a CPAP for my apnea, started taking antipsychotics to fall asleep, and a heart medicine that also nullifies nightmares. (The VA, though cumbersome, can pull through if you give it enough time) But I still couldn't fall asleep and stay asleep. King Louis XIII fixed that. The key to King Louis XIII's effectiveness is two fold: the body high and the mental sleepiness. It has this strange effect of essentially making your body and brain feel lazy. So, you don't fidget in your sleep and when you hit REM cycle, you stay there. It's better than all other indicas I've tried for sleeping (about three of them). I've tried it in both flower and concentrate - both work as well.