Supplementation
Participants consumed 15 g/day of CP derived from bovine hide or an inert, taste matched, CON as a 200 ml liquid bolus, without food, ~ 1 h before their scheduled bedtime (as recorded in the familiarisation trial) for 7 days. A 15 g CP dose was selected as it contains ~ 3.5 g of glycine, an amount shown to enhance sleep quality [