I've tried PT a few times and here is my expereince...
It seemed to work best for me when getting a few hours of sleep after injection. However, doing it before bed did NOT work for me because the massive wood that eventually comes during the middle of night and disrupts sleep...big time. One thing I'll say about PT, the one wood I got in middle of night was possibly the hardest bonar ever in my life...literally could hang a wet towel off it lol
Better protocol (for me)...since I usually always wake up to pee around 3-4 am, I would have a syringe preloaded in fridge to use during the pee break. Then I would get 2-3 hrs sleep after injecting and it's "kick in" happens while awake in morning.
To me this would be an ideal drug for a weekend trip away with a GF or wife that is open to spontaneous sex. It's less predictable than Trimix and PDE's but still a fun thing to play with.