"its very strange at first, serious nightmares, its almost like lucid dreaming, very 3d, and you have more ability to make decisions in the dream.  it takes me at least 2 hrs for it to work, and i have taken it and stayed in bed for hours with a horrible nights sleep.  it works different than ambien, it gives me a sedative feel.  make sure you have at least 7 hrs to sleep.  once you get used to it, the negative side effects i think go down.  the half life is longer than ambien and that&#039;s good but it still does not have the effect of a quick acting sleep med.  more expensive too because its new and there is no generic yet."