Depending on what you mean by night shift. When I worked 1500-2300 I would go before work. When I got off I would pack my lunch/dinner and snacks and lay out my workout clothes so I would just throw them on and go straight to the gym or for or run or whatever you do. When I worked 3rds 2300-0600 I would drink some NO explode or bullet proof coffee 30 min before the end of shift and go directly after work.