Data used for analysis in the current study.

RD–recording day; D–date as day and month; SST–time of sunset; SRT–time of sunrise; MRT–time of moonrise; MST–time of moonset; MI%–percentage of moon face illuminated; SONT–time of sleep onset; SOFT–time of sleep offset; TST (h)–total sleep time in hours; MSEd (h)–main sleep episode duration in hours; RSd (min)–recumbent sleep time in minutes; WBGTmin (°)–minimum wet bulb globe temperature in degrees; WBGTminT–time of minimum wet bulb globe temperature; WBGT SON (°)–wet bulb globe temperature at sleep onset; WBGT SOF (°)–wet bulb globe temperature at sleep offset; SLD MSEs (km)–straight line distance between main sleep episode sites in kilometres; D MSEs (km)–total distance traversed between main sleep episodes sites in kilometres; D M1/M2 MSEs (km)–distance between main sleep episode sites of matriarch 1 and matriarch 2 in kilometres; TAC MSE–sum of trunk activity counts between main sleep episodes; M1 –matriarch 1; M2 –matriarch 2; X–days without data as the elephants did not sleep on these days.