Morning or evening? stanford tests best time for insomnia therapy

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Males and females of any racial or ethnic group, aged 25-45 (inclusive) * Insomnia diagnosis via the DUKE * Fluent and literate in English * Written, informed consent * Reside within 60 miles of Stanford University Exclusion Criteria: * Presence of other sleep or circadian rhythm disorders that significantly contribute to their sleep disturbance. The presence of these disorders will be assessed by the DUKE structured interview for sleep disorders. * No regular use of benzodiazepine, opiate, thyroid, anticonvulsant or antipsychotic medications * Use of psychotropic medications that would significantly impact sleep, alertness, and no illicit drugs. * Excessive alcohol consumption (\>14 drinks per week or \> 4 drinks per occasion) * Presence of suicidal ideations representing elevated risk as determined by the Beck Depression Inventory (score of \> 0 on BDI question #9). * History of neurological or cardiovascular disorders, brain surgery, electroconvulsive or radiation treatment, brain hemorrhage or tumor, stroke, seizures or epilepsy, diabetes, hypo- or hyperthyroidism, head trauma with loss of consciousness greater than thirty minutes. * Substance abuse or dependence * History of significant head trauma followed by persistent neurologic deficits or known structural brain abnormalities OR traumatic brain injury in the past two months * Severe impediment to vision, hearing and/or hand movement, likely to interfere with the ability to complete the assessments, or are unable and/or unlikely to follow the study protocols * Pregnant or breast feeding * Current or lifetime history of bipolar disorder, PTSD or psychosis or current depression * Received cognitive behavioral therapy for insomnia within the past year * Current exposure to trauma, or exposure to trauma within the past 3 months * Working a rotating shift that overlaps with 2400h * Individuals who were high risk for sleep apnea on the Berlin Questionnaire and are not CPAP adherent * Participants with a current psychiatric disorder who are also on medications that significantly increase the risk of seizure. The antidepressants clomipramine, bupropion, maprotiline will be excluded because they are known to increase risk of up to 0.5-2.2% from a population reference range of 0.07- 0.08% in the general population and 0.1-4% in the population of people taking antidepressants.