Power Nap With TES-TI

This project aims to use transcranial electrical stimulation with temporal interference (TES-TI) to enhance the production of sleep slow waves, boosting the restorative power of sleep and mitigating cognitive impairment (mental fatigue) and its underlying cause (brain fatigue).

Inclusion criteria

• Adults aged 18-75 of any gender identity
• Self-reported non-restorative sleep, as measured by a REST-Q score
• English-speaking (able to provide consent and complete questionnaires)
• Capable of taking daytime naps
• US Citizen

Exclusion criteria

• Any current or history of neurological disorders or acquired neurological disease (e.g. stroke, traumatic brain injury), including intracranial lesions
• History of inpatient psychiatric hospitalization
• History of head trauma resulting in prolonged loss of consciousness; or a history of >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 seizures, diagnosis of epilepsy, history of abnormal (epileptiform) EEG, or family history of treatment resistant epilepsy except for 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 head
• Any medical devices or implants (i.e. cardiac pacemaker, medication infusion pump, cochlear implant, vagal nerve stimulator)
• Dental implants
• Permanent retainers
• Any hair braid, dreadlocks, hair pieces, or extensions which cannot be taken out before the study sessions
• Any head coverings or headdress that participant feels uncomfortable removing for the purposes of study sessions
• Any medication that may alter seizure threshold taken during the study i.e., 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); OTC antihistamines (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)