I must say that I think the metabolites of phenibut possibly have a lot to do with the effects. I had a few days off, and took 3.5 grammes, over the day, yesterday. I felt energetic, and my anxiety was reduced. I stopped taking it, and drank some alcohol, later. I went to bed at 3am, and woke at 12:30pm, feeling like I'd slept forever. I had to try hard to drag myself out of bed, and can still feel the effects now. The claims that the half-life is 5 hours are definitely not true. I feel the anxiety reducing effects more, the next day.