One of the best ways to prevent your body from getting catabolic and tearing down muscle tissue is to provide it with protein during the night. You might not want to set your alarm to wake yourself up, though — the disruption of sleep is a tradeoff that might not be worth the advantage of an extra protein shake. However, if you tend to wake up in the middle of the night, pound down 20-40 g of casein protein. Consider making this shake in advance (perhaps at the same time as your bedtime drink), so you won't have to invest more time or energy in preparations.