My pdoc says I am getting a little something out of my tiny dose besides sleep, but I really can't tell. I just know I get great sleep with 2.5 mg. She had me split one 5 mg pill into halves then split one half into quarters. The idea was to start with 1/4 ~20 minutes before trying to go to sleep, add the other quarter if needed, add the other half if needed. I needed the other quarter, but not the other half. I have been taking half (which is 2.5 mg) since then and I am very happy with it (except for the nasty taste). Gets me to sleep but I can be easily wakened and I am fairly alert if wakened. I am fully alert if I wake after 6 hours or so.