Table 2. 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.
| RD | D | SST | SRT | MRT | MST | MI% | SONT | SOFT | TST (h) | MSEd (h) | RSd (min) | WBGT min (°) | WBGT minT | WBGT SON (°) | WBGT SOF (°) | SLD MSEs (km) | D MSEs (km) | D M1/M2 MSEs (km) | TAC MSE | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M1 | M2 | M1 | M2 | M1 | M2 | M1 | M2 | M1 | M2 | M1 | M2 | M1 | M2 | M1 | M2 | M1 | M2 | M1 | M2 | ||||||||||
| 1 | 14 Apr | 18:11 | 6:32 | 16:52 | 5:31 | 99.8 | 3:30 | 1:05 | 6:10 | 4:25 | 3.3 | 2.1 | 0.92 | 0.33 | 0 | 37 | 18.42 | 6:00 | 22.14 | 23.33 | 18.53 | 21.45 | 2.70 | 17.64 | 7.07 | 22.1 | 10.32 | X | X |
| 2 | 15 Apr | 18:11 | 6:32 | 17:31 | 6:27 | 100.0 | 1:35 | 2:40 | 6:20 | 4:55 | 4.2 | 1.2 | 1.58 | 0.42 | 69 | 0 | 17.7 | 6:40 | 21.14 | 19.7 | 17.65 | 19.13 | 2.20 | 9 | 6.84 | 16.35 | 3.98 | 206259 | 331423 |
| 3 | 16 Apr | 18:10 | 6:32 | 18:12 | 7:24 | 99.6 | 3:40 | 0:15 | 6:00 | 4:45 | 2.2 | 1.9 | 0.83 | 0.75 | 57 | 0 | 16.61 | 7:00 | 17.94 | 19.3 | 17.43 | 17.4 | 2.77 | 1.36 | 9.04 | 11.65 | 0.18 | 243346 | 305782 |
| 4 | 17 Apr | 18:10 | 6:32 | 18:57 | 8:22 | 96.8 | X | X | X | X | X | X | X | X | 0 | 0 | 17.59 | 2:50 | X | X | X | X | X | X | X | X | X | X | X |
| 5 | 18 Apr | 18:09 | 6:33 | 19:46 | 9:22 | 91.6 | 1:05 | 1:40 | 3:45 | 3:55 | 2.4 | 2.0 | 1.75 | 0.83 | 0 | 0 | 17.92 | 5:20 | 20.12 | 19.45 | 18.57 | 18.4 | 29.26 | 29.07 | 54.92 | 51.49 | 1.30 | 514192 | 685219 |
| 6 | 19 Apr | 18:09 | 6:33 | 20:38 | 10:20 | 84.0 | 19:00 | 3:10 | 5:10 | 5:00 | 3.6 | 1.0 | 2.17 | 0.58 | 0 | 0 | 15.23 | 4:40 | 24.73 | 15.85 | 15.67 | 15.53 | 3.66 | 4.23 | 5.1 | 14.1 | 2.53 | 179234 | 409785 |
| 7 | 20 Apr | 18:08 | 6:33 | 21:35 | 11:17 | 74.5 | 2:55 | 3:05 | 6:00 | 5:55 | 2.9 | 2.8 | 1.42 | 1.33 | 0 | 28 | 14.64 | 5:30 | 17.75 | 17.66 | 15.83 | 15.83 | 4.02 | 1.61 | 13 | 10.53 | 4.16 | 396007 | 401057 |
| 8 | 21 Apr | 18:08 | 6:33 | 22:35 | 12:10 | 63.6 | 1:45 | 1:50 | 4:10 | 4:45 | 2.3 | 2.1 | 1.92 | 0.67 | 0 | 66 | 14.38 | 6:50 | 17.69 | 17.69 | 16.06 | 15.25 | 2.23 | 2.07 | 7.81 | 12.2 | 4.72 | 276659 | 360353 |
| 9 | 22 Apr | 18:07 | 6:34 | 23:36 | 13:01 | 51.8 | 2:25 | 23:50 | 4:55 | 5:55 | 2.2 | 3.3 | 1.75 | 1.25 | 122 | 0 | 16.02 | 1:40 | 17.11 | 19.69 | 18.31 | 16.82 | 3.21 | 0.98 | 19.21 | 10.85 | 7.71 | 297731 | 402186 |
| 10 | 23 Apr | 18:07 | 6:34 | 0:38 | 13:48 | 39.9 | 1:05 | 1:25 | 5:55 | 5:35 | 2.8 | 1.3 | 1.58 | 0.50 | 104 | 0 | 15.5 | 6:40 | 18.42 | 18.18 | 15.91 | 15.96 | 0.84 | 4.17 | 13.08 | 15.36 | 9.30 | 291464 | 368946 |
| 11 | 24 Apr | 18:06 | 6:34 | 1:39 | 14:32 | 28.6 | 2:15 | 4:50 | 3:15 | 5:30 | 0.8 | 0.5 | 0.42 | 0.17 | 0 | 0 | 18.66 | 3:30 | 20.25 | 20.48 | 18.67 | 19.84 | 11.16 | 2.95 | 15.67 | 16.39 | 1.74 | 292220 | 497660 |
| 12 | 25 Apr | 18:06 | 6:35 | 2:40 | 15:15 | 18.5 | 23:05 | 1:45 | 2:05 | 5:10 | 2.7 | 2.2 | 1.75 | 0.75 | 0 | 43 | 18.95 | 6:40 | 22.35 | 21.93 | 21.94 | 21.38 | 10.50 | 8.97 | 20.3 | 18.39 | 0.15 | 293754 | 393526 |
| 13 | 26 Apr | 18:05 | 6:35 | 3:40 | 15:57 | 10.3 | 0:05 | 2:00 | 5:55 | 5:25 | 2.8 | 0.4 | 1.33 | 0.17 | 46 | 0 | 20.98 | 4:20 | 23.21 | 22.16 | 21.97 | 21.78 | 13.91 | 14 | 22.02 | 20.76 | 0.21 | 324370 | 401567 |
| 14 | 27 Apr | 18:04 | 6:35 | 4:40 | 16:39 | 4.3 | 1:15 | 2:00 | 6:00 | 4:40 | 4.0 | 2.3 | 1.25 | 0.50 | 0 | 29 | 20.76 | 4:10 | 22.23 | 22.4 | 21.62 | 21.16 | 7.72 | 8.36 | 18.19 | 15.76 | 0.63 | 230105 | 408509 |
| 15 | 28 Apr | 18:04 | 6:35 | 5:39 | 17:22 | 0.9 | 4:00 | 2:30 | 6:05 | 5:45 | 1.9 | 2.2 | 1.75 | 0.33 | 18 | 0 | 14.11 | 5:00 | 15.12 | 16.86 | 14.47 | 14.39 | 8.26 | 7.44 | 16.69 | 16.33 | 0.25 | 283932 | 353663 |
| 16 | 29 Apr | 18:03 | 6:36 | 6:37 | 18:07 | 0.0 | 23:15 | 1:10 | 5:55 | 4:50 | 5.0 | 2.8 | 1.83 | 1.25 | 27 | 73 | 14.96 | 3:20 | 18.6 | 16.3 | 15.08 | 15.45 | 4.52 | 3.01 | 9.92 | 9.87 | 6.87 | 225604 | 323799 |
| 17 | 30 Apr | 18:03 | 6:36 | 7:35 | 18:54 | 1.7 | 2:30 | 0:25 | 6:15 | 4:10 | 4.5 | 3.0 | 3.75 | 1.58 | 93 | 47 | 12.95 | 6:40 | 14.02 | 14.71 | 13.48 | 14.87 | 4.88 | 0.54 | 8.42 | 10.49 | 10.12 | 237400 | 334396 |
| 18 | 1 May | 18:02 | 6:36 | 8:30 | 19:42 | 5.6 | 23:00 | 23:45 | 5:40 | 4:50 | 2.7 | 2.5 | 1.33 | 1.17 | 0 | 56 | 11.92 | 6:30 | 16.95 | 16.05 | 12.45 | 12.95 | 3.21 | 1.59 | 8.07 | 7.71 | 10.60 | 200556 | 353958 |
| 19 | 2 May | 18:02 | 6:37 | 9:23 | 20:32 | 11.3 | 0:30 | 1:00 | 6:10 | 5:45 | 4.0 | 3.1 | 1.58 | 1.75 | 0 | 0 | 13.32 | 6:40 | 16.28 | 16.08 | 13.72 | 13.82 | 3.71 | 1.73 | 11.95 | 10.63 | 12.52 | 233373 | 356489 |
| 20 | 3 May | 18:01 | 6:37 | 10:12 | 21:23 | 18.6 | 4:05 | 23:05 | 5:55 | 5:20 | 1.6 | 3.3 | 0.33 | 1.08 | 0 | 0 | 13.26 | 5:30 | 13.97 | 16.62 | 14.46 | 13.62 | 2.14 | 0.99 | 11.98 | 11.81 | 10.87 | 276196 | 306004 |
| 21 | 4 May | 18:01 | 6:37 | 10:59 | 22:13 | 27.0 | 2:30 | 2:45 | 6:00 | 4:50 | 2.9 | 1.5 | 1.50 | 0.92 | 0 | 0 | 11.18 | 6:30 | 15.95 | 16.26 | 11.46 | 12.23 | 0.97 | 1.43 | 11.01 | 7.88 | 12.63 | 239936 | 344733 |
| 22 | 5 May | 18:00 | 6:38 | 11:41 | 23:04 | 36.1 | 1:10 | X | 6:00 | X | 3.2 | X | 1.42 | X | 0 | 0 | 11.59 | 6:30 | 15.7 | X | 11.81 | X | 1.23 | X | 10.96 | X | X | 237326 | X |
| 23 | 6 May | 18:00 | 6:38 | 12:21 | 23:55 | 45.7 | 1:35 | 21:20 | 4:45 | 5:10 | 2.9 | 3.6 | 1.33 | 2.33 | 142 | 26 | 14.58 | 7:00 | 15.71 | 19.98 | 14.8 | 14.82 | 5.43 | 26.86 | 9.88 | 47.88 | 34.05 | 214613 | 673390 |
| 24 | 7 May | 17:59 | 6:38 | 12:59 | 0:45 | 55.5 | 2:50 | 2:00 | 5:35 | 5:45 | 2.5 | 1.4 | 1.08 | 0.42 | 0 | 0 | 16.55 | 6:50 | 19.56 | 19.91 | 17.4 | 17.28 | 4.41 | 10.32 | 9.92 | 20.14 | 25.12 | 253618 | 396942 |
| 25 | 8 May | 17:59 | 6:39 | 13:36 | 1:36 | 65.2 | X | 2:00 | X | 4:05 | X | 1.3 | X | 0.92 | 0 | 0 | 15.53 | 6:50 | X | 18.43 | X | 15.64 | X | 0.73 | X | 27.28 | X | X | 288319 |
| 26 | 9 May | 17:58 | 6:39 | 14:12 | 2:27 | 74.4 | 22:15 | 2:55 | 3:40 | 4:40 | 2.7 | 1.3 | 1.83 | 0.42 | 0 | 0 | 13.88 | 6:00 | 20.2 | 15.89 | 15.83 | 15.37 | 40.21 | 5.37 | 66.41 | 16.73 | 17.70 | 451563 | 370766 |
| 27 | 10 May | 17:57 | 6:39 | 14:48 | 3:20 | 82.8 | 3:35 | 2:00 | 5:00 | 6:20 | 1.2 | 1.6 | 0.83 | 0.42 | 0 | 0 | 13.27 | 6:50 | 14.85 | 15.14 | 13.61 | 13.3 | 2.62 | 0.65 | 9.09 | 11 | 16.76 | 353840 | 330753 |
| 28 | 11 May | 17:57 | 6:40 | 15:26 | 4:14 | 90.0 | 3:30 | 3:15 | 5:35 | 5:15 | 2.2 | 1.8 | 2.08 | 0.75 | 0 | 0 | 12.89 | 6:30 | 14.09 | 14.08 | 13.46 | 13.45 | 9.34 | 3.85 | 14.77 | 9.06 | 4.23 | 318708 | 338533 |
| 29 | 12 May | 17:56 | 6:40 | 16:06 | 5:11 | 95.5 | 4:05 | 3:20 | 4:55 | 3:35 | 0.8 | 0.3 | 0.67 | 0.25 | 0 | 0 | 15.05 | 7:00 | 17.77 | 17.71 | 16.22 | 17.89 | 8.19 | 1.7 | 19.05 | 28.3 | 4.34 | 276893 | 341444 |
| 30 | 13 May | 17:56 | 6:40 | 16:49 | 6:09 | 99.0 | 0:50 | 2:25 | 4:30 | 3:40 | 1.0 | 1.3 | 0.50 | 0.50 | 0 | 0 | 11.84 | 6:30 | 13.9 | 13.65 | 13.48 | 13.62 | 15.30 | 5.49 | 24.92 | 13.92 | 16.96 | 305825 | 359688 |
| 31 | 14 May | 17:55 | 6:41 | 17:35 | 7:10 | 100.0 | X | 2:10 | X | 4:35 | X | 1.8 | X | 1.33 | 0 | 0 | 8.34 | 6:40 | X | 11.71 | X | 8.95 | X | 5.1 | X | 8.83 | X | X | 312158 |
| 32 | 15 May | 17:55 | 6:41 | 18:29 | 8:10 | 99.9 | 22:50 | 0:00 | 5:45 | 3:45 | 1.3 | 3.4 | 0.83 | 1.08 | 0 | 48 | 9.22 | 6:30 | 13.88 | 16.27 | 9.55 | 11.04 | 9.52 | 11.83 | 31.95 | 19.8 | 4.90 | 634010 | 289410 |
| 33 | 16 May | 17:54 | 6:41 | 19:26 | 9:09 | 98.1 | 1:15 | 2:50 | 3:45 | 4:55 | 1.8 | 1.8 | 0.42 | 1.42 | 41 | 0 | 10.61 | 5:50 | 12.59 | 12.06 | 11.48 | 11.06 | 5.16 | 13.35 | 12.17 | 19.2 | 16.44 | 354017 | 363174 |
| 34 | 17 May | 17:54 | 6:42 | 20:26 | 10:06 | 93.5 | 1:35 | 3:15 | 3:05 | 3:50 | 0.4 | 0.6 | 0.08 | 0.33 | 0 | 0 | 11.16 | 6:50 | 13.93 | 12.82 | 13.2 | 12.07 | 1.51 | 2.06 | 6.77 | 14.02 | 15.74 | 319731 | 329249 |
| 35 | 18 May | 17:53 | 6:42 | 21:29 | 11:03 | 86.3 | 21:40 | 2:20 | 3:50 | 5:50 | 0.6 | 1.3 | 0.17 | 0.50 | 0 | 0 | 12.52 | 4:00 | 18.08 | 14.37 | 12.62 | 12.97 | 6.62 | 18.4 | 7.78 | 24.97 | 8.38 | 268639 | 364092 |