I feel your pain: I did 2.5 years of 7pm-7am, 6 days a week, then another year of flip-flopping between day and night shift. I now work only 7am-7pm, 5-6 days a week, but I have a wife, a 5yo, and a 9mo, and a coffee roasting business on the side, which I tend to after I get home from my 12 hour shifts. Plus, I work out 3 nights a week.
I'd consider PGHt invaluable. I'm not taking it now only because I ran out, and I only had money for AP, which I was dying to try. I'll be back on indefinitely, soon.