I'd give it more than a month to adapt, but you should try to identify some specific benefits you want to achieve. Looking for a general sense of "wellness" or "alertness" is going to be hard to affirm and credit. But you can watch for and recognize more specific goals like you wake less groggy, fall asleep more easily, exercise more effectively, work with more lasting focus, stay more composed in trying situations, etc. The goals will be personal.
And if you weren't struggling with anything that better sleep might fix, maybe it's true that you don't need it!
I've also noticed that being tired hits me a LOT harder than it used to. Previously I guess I was kind of tired all the time so the marginal difference wasn't much but the last few months if I'm feeling the afternoon/early evening slump its much more difficult to push through and get anything accomplished, even if whats getting accomplished is just spending time with my family and trying not to nod off on the couch.
It's supposably a lot better for health, so I'm going to keep doing it, but its an adjustment and it does feel like I'm wasting at least some of my time.