Dietary and Hydration Control
To control for diet, the participants were asked to record what they ate over the past 36 hours before the first experimental day. For all subsequent sessions, they were asked to repeat what they ate initially. In addition, the participants were given a hydration protocol to follow, which included asking them to ingest 600 ml (20 oz.) of water, sports drink, or flavored water 4 hours before going to bed and then again upon immediately going to bed.