5'10 170 is probably the equivalent of being 6'2 200+ shredded.
I had a 28" waist once, had no abs though, probably wouldnt be able to get that small again since lower back + abs will have developed somewhat. Actually i wonder if i will have abs when i get leaner, i'm not one of those ectos that looks really lean i have no definition whatsoever and never did.
Edit: also been taking melatonin for a week now. At first i thought it was a miracle supp, got to sleep really fast and had the right amount of energy during the day. Since then i seem to have been waking quite a lot at night and not really getting to sleep that fast either.