(Phase 1 and 2): - Medically healthy - English-speaking (able to provide consent and complete questionnaires) - Citizen or legal resident

(Phase 1): - Any current or recent history (6 months) of any mental health diagnosis (Examples include major depression, hypomania, psychosis, schizophrenia, and bipolar disorder) - Any current or recent (past 6 months) history of treatment for mental illness (including anti-depressant/anti anxiety medications, therapy) - Scoring above Moderate range for Anxiety or Depression - Patient Health Questionnaire-9 (PHQ-9) greater than or equal to 15 or General Anxiety Disorder (GAD7) greater than or equal to 15 - At risk for suicide (PHQ item 9 greater than 0) - Any current or past history of neurological disorders or acquired neurological disease (e.g. stroke, traumatic brain injury), including intracranial lesions and obstructive sleep apnea - History of head trauma resulting in prolonged loss of consciousness; or a history of greater than 3 grade I concussions - Current history of poorly controlled headaches including intractable or poorly controlled migraines - Any systemic illness or unstable medical condition that may cause a medical emergency in case of a provoked seizure (cardiac malformation, cardiac dysrhythmia, asthma, etc.) - History of fainting spells of unknown or undetermined etiology that might constitute seizures - History of seizures, diagnosis of epilepsy, history of abnormal (epileptiform) electroencephalogram, or family history of treatment resistant epilepsy with the exception of a single seizure of benign etiology (e.g. febrile seizures) in the judgment of a board-certified neurologist - Possible pregnancy or plan to become pregnant in the next 6 months. - Any metal in the brain, skull or elsewhere - Any hair braid, dreadlocks, hair pieces, or extensions which cannot be taken out before the MRI scans and/or sleep stimulation sessions - Any head coverings or headdress that participant feels uncomfortable removing for the purposes of the MRI scans and/or sleep stimulation sessions - Any medical devices or implants (i.e. cardiac pacemaker, medication infusion pump, cochlear implant, vagal nerve stimulator) unless otherwise approved by the responsible physician - Dental implants containing metal (titanium or titanium alloys) surgically implanted post and core - Substance use disorder within the past six months - Any medication that may alter seizure threshold i.e., Attention-deficit/hyperactivity disorder (ADHD) stimulants (Adderall, amphetamine); Tricyclic/atypical antidepressants (amitriptyline, doxepine, imipramine, maprotiline, nortriptyline, bupropion); Antipsychotics (chlorpromazine, clozapine), Bronchodilators (theophylline, aminophylline); Antibiotics (fluoroquinolones, imipenem, penicillin, cephalosporins, metronidazole, isoniazid); Antivirals (valacyclovir, ritonavir); Over the Counter (OTC) (diphenhydramine, Benadryl) - Claustrophobia (a fear of small or closed places) - Back problems that would prevent lying flat for up to two hours - Regular night-shift work (second or third shift) - Do not have access to a smartphone or the internet - Regular meditation practice and/or prior use of the Healthy Minds Program app - Cannot visit the lab in-person for 7 consecutive weeks in the next year - Permanent retainers Additional Exclusion Criteria (Phase 2): - Any current or recent history (6 months) of bipolar disorder, psychosis, schizophrenia. A history of stable depression or anxiety is not exclusionary. - Mental health treatment (e.g, psychotherapy) is no longer exclusionary, although all the medication exclusions outlined above still apply