I'm not a big fan of injecting right before bed. I like to inject before I am going to do something active like workout, cardio, etc. Maybe is psychological, but I like to feel like I am helping it get out of the injection area & into my system.
I wonder too. I do Sus 12 hours prior to workout so the shorter acting test is trying to do someting for me. The slower acting stuff takes a while so I don't think it matters.