The purpose of the work is to study the time preferences of students performing daily tasks during distance learning and to determine if such preferences depend on sex and the year of study. In the absence of social regulation, the daytime and nighttime activity of students corresponded to the distribution of chronotypes that typifies a northern region, with arrhythmic and evening types prevailing but the morning bio-rhythmic stereotype having a minimal representation. With no ‘master timer’ in distance learning, students demonstrated pronounced sex differences in the daily dynamics of performance. Young females had maximum performance during the day and minimum performance at night, which corresponds to the most common type. Young males were observed to have several ascents in their performance during the 24-hour period. First-year and second-year students’ learning behavior was less synchronized with the day-night cycle. The wavelet analysis found insignificant four to five hourrhythmic fluctuations that occurred in the evening hours, during the period of students’ high educational performance.

Patients should be examined for blood pressure regulation disorders starting from a young age though adolescence and young adulthood. In this aspect, it is necessary to pay attention to neurocirculatory dystonia, as a phenomenon of impaired adaptation to changing environmental and internal conditions in which the neurohumoral regulation of various body systems, including cardio-vascular, can be violated. The aim of this work was to study the inter-gender characteristics of blood pressure rhythms and heart rate in patients with hypertensive neurocirculatory dystonia living in the northern region. Wavelet analysis was used to test the hypothesis of numerous cyclicities. In patients with neurocirculatory dystonia, especially in women, the circadian structure of hemodynamic rhythms was observed to decay with an increased average daily value. The violation of vegetative regulation of arterial pressure rhythms was present in the examined northerners in the form of mesor, hyper-amplitude and ultradian desynchronosis.