Can I take Whey Protein before bed?

Yes, whey protein powder can be used effectively before bed if after a resistance training workout, but casein is a better choice if you have not had a workout. Casein unlike whey is digested at a very slow rate and can take up to 7 hours. This allows for a slow and constant trickle of amino acids into your system throughout the night which has an anti-catabolic. This maintains muscle mass and reduces muscle breakdown during your sleep.