I know exactly what you mean. It's like you can sleep if you want, or just stay up and relax. In fact, I do it every night.
I typically take the product, relax with my wife in front of the television for a couple hours, then go to bed and fall asleep right away. If I wanted to, I could go to sleep as soon as the product kicks in, but I actually like the feeling it provides (contentedness), so I choose not to go to bed right away.
I also LOVE the fact that, if I wake up, I can actually fall back asleep again. Without the product, I have trouble with that.