Scientific instruments and apparatus, electronic apparatus, namely, apparatus used for research of sleep state and brain activity; monitoring apparatus, namely, portable monitoring apparatus for monitoring physiological variables, namely, patient variables for research purposes, namely, EEG (electroencephalogram), MEG (magnetoencephalogram), CT(computer tomography), EOG (electrooculogram), EMG (electromyogram), SaO2 (oxygen saturation), CO2 (carbon dioxide) nasal air-flow, body movement, thor...