Randomized Trialhigh evidence
Presleep Whey but Not Casein Protein Ingestion Improves Sleep Quality After Resistance Exercise When Compared With an Isocaloric Control in Resistance Trained Individuals.
International journal of sport nutrition and exercise metabolism·July 7, 2026·PMID 42413910
Why it mattersPresleep protein is a common strategy for recovery and muscle protein synthesis, but its effects on sleep quality are underexplored. This study suggests whey may offer sleep benefits over casein or carbohydrate, which could influence supplement choice for athletes prioritizing both recovery and sleep.
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