Validation of Presence-IP1.0 for Detection of Consciousness Using Reduced-Montage TMS-EEG

Inclusion Criteria: * Healthy adults greater than or equal to 18 years * Able to provide informed consent * Able to undergo TMS and EEG recordings * Able to sleep in laboratory setting Exclusion Criteria: * History of neurological or psychiatric disorders * Pregnancy * Sleep disorders affecting normal sleep architecture * 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.) * Possible pregnancy or plan to become pregnant in the next 6 months * Any metal in the head * Any metal in the body * Any medical devices or implants (i.e. cardiac pacemaker, medication infusion pump, cochlear implant, vagal nerve stimulator) unless otherwise approved by the responsible MD * Dental implants * Permanent retainers * Claustrophobia (a fear of small or closed places) * Back problems that would prevent lying flat for several hours * Regular night-shift work (second or third shift)