Tkachenko Olga N. Dorokhov Vladimir B. Dementienko Valeriy V. Gandina Eugenia O. Arsenyev Gleb N. Taranov Anton O. Puchkova Alexandra N. Bakirova Diana R. Sveshnikov Dmitry S. Discrepancy between subjective and objective health indicators when performing monotonous operator activities against the background of chronic sleep deprivation