actually immediately. I took 2 caps my first time and it MADE me drowsy, went ahead and took a nap at 6pm. When my wife woke me at 9 I got up made a protein shake and went right back to sleep till 6am.
Dunno maybe it wont effect everyone that way... I usually train late, and typically toss and turn through the night but when I take 1 cap after training I go right to sleep and usually only get up to pee. Its not SUPER DEEP sleep though like GH releasers cause but its still restful and less disturbed. I much prefer using a different supp for DEEP sleep effects though thus why Im so excited for Xdreams to come out. I dont take the Reverse FOR these effects its just something Ive noticed.