please don't do 75 pushups RIGHT before bed. I mean if you did 25, 3 times daily spaced out to simply keep a nice chest pump that is one thing, but honestly 75 pushups right before bed I would believe would elicit minimal gains for maximum recovery time.
At least that is my experience...Perhaps others have differing opinions on the topic, but I believe that this would be overtraining and of much lower efficacy than a DC-like training program that would pack on strength and size in your chest in no time.