Protein before bed: does a nighttime snack help muscle growth?
Overnight sleep is often the longest stretch of the day without food, and during this time muscle protein breakdown can outweigh muscle protein synthesis. Researchers have tested whether eating protein shortly before bed changes that balance. Studies giving around 30 to 40 grams of casein, a slow-digesting milk protein, before sleep found that it is digested and absorbed during the night and increases overnight muscle protein synthesis, especially after evening training.
Whether this translates into more muscle over months is less clear. Some training studies found greater gains in muscle size and strength when people took protein before bed, but in many of them the pre-sleep group also ate more protein overall. When total daily protein is matched, the extra benefit of timing appears small. That means pre-sleep protein is best seen as a convenient way to reach your daily target, particularly if you struggle to eat enough protein during the day, rather than a magic window.
How much protein do you actually need? Get your daily target with our free protein calculator.
Calculate my proteinIf you want to try it, a serving of cottage cheese, Greek yogurt, quark, milk or a casein shake about 30 to 60 minutes before bed provides a slow-digesting protein dose. Plant options or a regular whey shake also work, though they are absorbed faster. Studies so far suggest that a moderate protein snack at night does not harm sleep or fat loss in healthy people when it fits within total calories. People with reflux or digestive issues may prefer to keep the last meal a bit earlier.
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