HOW TO QUANTIFY SLEEPINESS DURING AN ATTEMPT TO SLEEP? Article Putilov A.A., Sveshnikov D.S., Yakunina E.B., Mankaeva O.V., Puchkova A.N., Shumov D.E., Gandina E.O., Taranov A.O., Ligun N.V., Donskaya O.G., Verevkin E.G., Dorokhov V.B. Physiological Measurement. Institute of Physics. Vol. 45. 2024.