Cheeky, I can't speak for Daycrawler but in my experience pheni behaves as a mild muscle relaxant at lower doses (500-750mg) and general sedative at higher (1,000mg+) It's effective for somatic tension states to relax, but the central effect is too long-lived for a sleeper IMO. If you don't go to bed early (and it's probably already late if you're resorting to a sleep aid, lol) then don't be surprised if there is some annoying residual hypotonia the next morning.
Oh and migraine. It seems to help with alleviation of cluster migraine much like benzos can, but IME it's crucial to dose during the prodrome and not wait until it's fully developed!
As for addiction, it never hinted at habituation for me, but I did know a women who took about 15g one time in an attempt to "piss off her husband" and experience protracted respiratory depression with no further sequela after ~24hrs. She was also fond of alcohol, so perhaps it shares a similar addictive profile? Just speculation.