The supplement you should consider is Citrulline.* It's a non-essential amino acid that supports Arginine content in the body.* And Arginine is a pre-cursor to Nitric Oxide leading to vasodilation - in other words - muscle PUMPS.* Vasodilation means your blood vessels expand, helping you with oxygen and nutrient flow during your workouts.*
You can even take Citrulline as part of a pre-workout before you go to the gym at night. Citrulline is not a stimulant, so you shouldn't have problems getting restful sleep.
Citrulline makes a great combo with branched chain amino acids, BCAAs, or other pre-workout ingredients like Creatine, Carbs, Caffeine and more. You can find Citrulline as a standalone product or in combinations with other ingredients.