Study: NCT06104280

Intervention type: DEVICE
Group type: OTHER
Intervention: Actigraphy
Description: 7-day actigraphy period will be used to determine the habitual sleep start and wake times. The CamNTech MotionWatch8 (Cambridge, UK) is a solid-state piezo-electric accelerometer that collects data on activity (i.e., arm motion) and ambient light.Actigraphy data are downloaded from the MotionWatch8 into the software (MotionWare) for analysis, management, and exportation. Bed and wake times will be entered by the subjects via a REDCap link and this information coupled with the sleep diary reports will be entered to determine sleep intervals. Algorithms in the Motion Watch 8 software will determine sleep start, sleep end, total sleep time (duration), sleep quality, sleep efficiency, wake after sleep onset, and sleep fragmentation

Intervention type: OTHER
Group type: EXPERIMENTAL
Intervention: DLMO
Description: Participants will be given an evening meal and then be accompanied to the UAB Highlands Hospital Sleep Unit by 5:30pm. The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels.Participants will be allowed to sleep in darkness until 8:00am, at which time they will be provided transportation.We will also bank frozen samples taken prior to the light exposure for later calculation of the Dim Light Melatonin Onset (DLMO), a circadian phase estimate.

Intervention type: OTHER
Group type: EXPERIMENTAL
Intervention: DLMO
Description: Participants will be given an evening meal and then be accompanied to the UAB Highlands Hospital Sleep Unit by 5:30pm. The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels.Participants will be allowed to sleep in darkness until 8:00am, at which time they will be provided transportation.We will also bank frozen samples taken prior to the light exposure for later calculation of the Dim Light Melatonin Onset (DLMO), a circadian phase estimate.

Intervention type: OTHER
Group type: EXPERIMENTAL
Intervention: DLMO
Description: Participants will be given an evening meal and then be accompanied to the UAB Highlands Hospital Sleep Unit by 5:30pm. The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels.Participants will be allowed to sleep in darkness until 8:00am, at which time they will be provided transportation.We will also bank frozen samples taken prior to the light exposure for later calculation of the Dim Light Melatonin Onset (DLMO), a circadian phase estimate.

Intervention type: OTHER
Group type: OTHER
Intervention: DLMO
Description: Participants will be given an evening meal and then be accompanied to the UAB Highlands Hospital Sleep Unit by 5:30pm. The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels.Participants will be allowed to sleep in darkness until 8:00am, at which time they will be provided transportation.We will also bank frozen samples taken prior to the light exposure for later calculation of the Dim Light Melatonin Onset (DLMO), a circadian phase estimate.

Intervention type: OTHER
Group type: EXPERIMENTAL
Intervention: Melatonin Suppression Test
Description: The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels. Participants will be asked to refrain from caffeine consumption 12 hours before reporting to the sleep unit and will provide 2-3 ml of saliva every 30 minutes starting at 6:00pm and ending after the light exposure. For melatonin suppression, 2-hours light exposure will begin 2 hours before the calculated mid-sleep time. Collection saliva samples 1-h, 30-min, and immediately before the light exposure and every 30 min throughout exposure. Samples will be centrifuged and frozen/stored at -20ºC until assay and remaining samples stored at -80ºC. Melatonin levels will be assayed via the Buhlmann Direct Saliva Melatonin. Melatonin suppression will be calculated as the percent decrease from the sample taken immediately prior to the light exposure

Intervention type: OTHER
Group type: EXPERIMENTAL
Intervention: Melatonin Suppression Test
Description: The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels. Participants will be asked to refrain from caffeine consumption 12 hours before reporting to the sleep unit and will provide 2-3 ml of saliva every 30 minutes starting at 6:00pm and ending after the light exposure. For melatonin suppression, 2-hours light exposure will begin 2 hours before the calculated mid-sleep time. Collection saliva samples 1-h, 30-min, and immediately before the light exposure and every 30 min throughout exposure. Samples will be centrifuged and frozen/stored at -20ºC until assay and remaining samples stored at -80ºC. Melatonin levels will be assayed via the Buhlmann Direct Saliva Melatonin. Melatonin suppression will be calculated as the percent decrease from the sample taken immediately prior to the light exposure

Intervention type: OTHER
Group type: EXPERIMENTAL
Intervention: Melatonin Suppression Test
Description: The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels. Participants will be asked to refrain from caffeine consumption 12 hours before reporting to the sleep unit and will provide 2-3 ml of saliva every 30 minutes starting at 6:00pm and ending after the light exposure. For melatonin suppression, 2-hours light exposure will begin 2 hours before the calculated mid-sleep time. Collection saliva samples 1-h, 30-min, and immediately before the light exposure and every 30 min throughout exposure. Samples will be centrifuged and frozen/stored at -20ºC until assay and remaining samples stored at -80ºC. Melatonin levels will be assayed via the Buhlmann Direct Saliva Melatonin. Melatonin suppression will be calculated as the percent decrease from the sample taken immediately prior to the light exposure

Intervention type: OTHER
Group type: OTHER
Intervention: Melatonin Suppression Test
Description: The sleep unit allows for strict control of light exposure (\< 5 lux at eye level), room temperature and oral intake factors that could alter melatonin levels. Participants will be asked to refrain from caffeine consumption 12 hours before reporting to the sleep unit and will provide 2-3 ml of saliva every 30 minutes starting at 6:00pm and ending after the light exposure. For melatonin suppression, 2-hours light exposure will begin 2 hours before the calculated mid-sleep time. Collection saliva samples 1-h, 30-min, and immediately before the light exposure and every 30 min throughout exposure. Samples will be centrifuged and frozen/stored at -20ºC until assay and remaining samples stored at -80ºC. Melatonin levels will be assayed via the Buhlmann Direct Saliva Melatonin. Melatonin suppression will be calculated as the percent decrease from the sample taken immediately prior to the light exposure