Fig. 5.

Hypnograms showing the physiological and correlated behavioral state transitions occurring over a 24-hour period for one hyrax (H06) starting at 9 a.m. The shaded area represents the dark period. The polycyclic nature of sleep is visible in the physiological hypnogram, with SWS equally represented during both the light and dark periods. The animal also appeared to be more active and was eating more during the dark periods compared to the light periods for the 24 h represented here.