Artemis Sleep Countermeasures

Participants will be provided with comfortable headphones to wear throughout their daytime sleep opportunity. The headphones will deliver a continuous pink noise sound no greater than 50 decibels. Participants will be allowed to turn down the sound of the pink noise if they find it too loud. Participants will wear the headphones with no noise during the placebo condition.

Participants randomized to the blue-enriched light and nap condition will have the blue-enriched light turned on during their nighttime stay in the lab. The light will be turned off for up to one hour during the nap. During the placebo condition, participants will have an overhead room light of \~150 lux illuminated throughout their nighttime stay in the lab. This light level reflects an older NASA standard which was used in the design of some Artemis vehicles. During the placebo condition, participants will be asked to engage in quiet activities such as reading for one hour.