Circadian Rhythms and Homeostatic Sleep Drive and Their Effect on Reward and Cognitive Control Systems in Adolescents

Inclusion Criteria: * Age 13-18 years * Currently enrolled in a traditional high-school (not cyber- or home-schooled) \[school closures during the COVID-19 pandemic are an exception to this\] * Physically and psychiatrically healthy * Provision of written informed consent and assent Exclusion Criteria: * outside age range above * have a history of alcohol, cannabis, or illicit drug use greater than weekly use in the past year * have serious medical or neurological disorders, including history of seizures * have serious psychiatric disorders (e.g. bipolar disorder and schizophrenia) * taking antidepressants (SSRIs/SSNIs are OK) or medications known to impact sleep/wake function - some medications may be okay if willing and able to discontinue prior to and/or for laboratory procedures * have sleep disorders other than insomnia or Delayed Sleep Phase Disorder * have MRI contraindications (i.e., metal in the body; claustrophobia) * first degree relative with bipolar disorder * frequent headaches or migraines * inability to swallow pills/capsules. * pregnancy * participants with observed Obstructive Sleep Apnea via Apnealink, as indicated by an Apnea Hypopnea Index (AHI) of greater than 5 * Less than 80 lbs. or a BMI of greater than 35