Light-induced melatonin suppression
Conditions
Interventions
This single-centre laboratory study uses a repeated-measures, within-subject design. Participants complete five evening laboratory sessions: one dim-light control session and four bright-light exposur
Sponsors
Max Planck Society
Eligibility
Sex/Gender
All
Age
23 Years to 35 Years
Inclusion criteria
Inclusion criteria: 1. Age 23–35 years 2. Good physical and mental health 3. Normal or corrected-to-normal visual acuity and normal colour vision 4. Regular sleep–wake behaviour 5. For naturally cycling participants: regular menstrual cycles (26–35 days) 6. For oral contraceptive users: stable intake of monophasic combined oral contraceptive for =6 months
Exclusion criteria
Exclusion criteria: 1. Chronic medical, hormonal, ocular, neurological or psychiatric disorders 2. Regular use of systemic medication (except anti-allergic medication) 3. Shift work or inter-time-zone travel in the last month 4. Extreme chronotype or excessive daytime sleepiness 5. Current or recent pregnancy or breastfeeding 6. Intake of exogenous hormones other than contraceptive hormones 7. Substance abuse, excessive alcohol consumption, or recreational drug use
Countries
Germany
Contacts
Public ContactCarolina Guidolin
Outcome results
None listed