Posting this as a personal experience only — I'm one person, this isn't a recommendation, and I'm not going to talk numbers or how I used anything. Please read it as an anecdote.
Context: I've dealt with a low hum of daytime anxiety for years, the kind that isn't disabling but makes focus harder. I got curious about Selank after reading that it's studied as an anxiolytic in Russian research. Over a stretch of a few weeks the thing I noticed most wasn't sedation — it was that the 'edge' felt a little lower and I ruminated less in the afternoons. Sleep itself didn't change much for me.
What I want to be honest about: this is exactly the kind of subjective, unblinded experience that's easy to fool yourself with. I made some other life changes in the same window (walking more, cutting late caffeine), so I genuinely can't separate the variables. That's the honest version.
I'd still encourage anyone actually struggling to work with a professional rather than reading forum posts like mine. Sharing mostly because I wanted to add a grounded data point to the pile.