*4.3. Sleep Duration and Quality*

Our findings suggest that shelter-in-place measures a disrupted sleep duration. It turned out that the study participants went to bed later, and the results are challenging to interpret unequivocally.

We also found that the results differed by age group. Conversely, we noticed a significant drop in the average sleep time among octogenarians (−13.48%; −57.91; 95% CI, 16.33 to 99.49). The rest of the study participants did not significantly benefit from selfisolation in terms of sleep duration. Only one study participant had the same duration of sleep in both periods. We found that younger and active participants increased the length of sleep (Figure 9). The most physically and professionally active subject from our study group (Subject 1) had a significant increase in sleep time during the lockdown. The comparison of the average sleep time between reference and self-isolation for all study participants was shown in Figure 10. Interestingly, we found that the length of sleep in octogenarians decreased significantly during the Covid-19 period (Figure 11).
