Table 2.
Selected sleep measures and motor activity counts in short (SS, n=7), intermediate (IS, n=15) and long (LS, n=7) sleep rats during total 24 h and separate 12 h light and dark periods in two consecutive recording days. Values are means ± SEM. Different letters indicate significant differences from the other groups (Tukey test, p < 0.05).
| Day 1 | Day 2 | |||||
|---|---|---|---|---|---|---|
| Total | Light | Dark | Total | Light | Dark | |
| Total Sleep | ||||||
| SS | 574 (7.9) c | 426 (13.8) c | 147 (8.4) b | 595 (6.9) c | 444 (6.7) b | 151 (3.1) b |
| IS | 627 (6.8) b | 478 (3.7) b | 149 (6.5) b | 649 (7.7) b | 481 (7.3) a | 168 (6.2) b |
| LS | 708 (11.3) a | 512 (6.6) a | 196 (9.1) a | 700 (7.4) a | 502 (7.8) a | 198 (6.9) a |
| NREM Time | ||||||
| SS | 483 (9.7) c | 361 (14.5) c | 122 (6.8) b | 504 (9.2) c | 377 (8.2) c | 127 (3.6) b |
| IS | 528 (7.0) b | 405 (3.5) b | 123 (5.9) b | 548 (7.7) b | 408 (5.5) b | 140 (5.4) b |
| LS | 608 (11.4) a | 444 (8.3) a | 164 (7.6) a | 602 (9.9) a | 436 (10.2) a | 166 (4.8) a |
| NREM % | ||||||
| SS | 84.1 (0.7) | 84.6 (1.0) | 82.7 (1.3) | 84.7 (0.7) | 84.9 (1.0) | 84.0 (1.1) |
| IS | 84.2 (0.5) | 84.8 (0.6) | 82.3 (1.0) | 84.5 (0.7) | 85.1 (0.7) | 83.2 (1.1) |
| LS | 85.9 (0.5) | 86.7 (0.9) | 83.9 (0.7) | 85.9 (0.6) | 86.8 (1.0) | 83.8 (1.2) |
| Number of NREM Episode | ||||||
| SS | 179 (5.6) | 120 (6.1) | 59 (2.3) | 172 (5.0) | 113 (3.7) | 58 (3.5) |
| IS | 168 (4.2) | 108 (2.8) | 60 (2.8) | 176 (5.4) | 110 (2.9) | 66 (3.2) |
| LS | 168 (2.2) | 107 (2.1) | 61 (3.0) | 173 (5.3) | 108 (3.0) | 65 (4.3) |
| Average NREM Episode Length | ||||||
| SS | 2.7 (0.10) c | 3.0 (0.19) c | 2.1 (0.14) b | 2.9 (0.09) b | 3.3 (0.14) b | 2.2 (0.09) b |
| IS | 3.2 (0.06) b | 3.8 (0.10) b | 2.1 (0.07) b | 3.2 (0.10) ab | 3.8 (0.12) ab | 2.2 (0.09) ab |
| LS | 3.6 (0.10) a | 4.2 (0.11) a | 2.7 (0.16) a | 3.5 (0.14) a | 4.1 (0.16) a | 2.6 (0.13) a |
| REM Time | ||||||
| SS | 91 (3.4) | 65 (3.2) | 26 (2.5) | 91 (3.7) | 67 (4.0) | 24 (1.5) |
| IS | 99 (3.4) | 73 (3.2) | 26 (1.6) | 100 (4.5) | 72 (4.3) | 28 (2.1) |
| LS | 100 (3.4) | 68 (4.5) | 32 (2.2) | 98 (3.5) | 66 (4.6) | 32 (3.2) |
| REM % | ||||||
| SS | 15.9 (0.7) | 15.4 (1.0) | 17.3 (1.3) | 15.3 (0.1) | 15.1 (0.1) | 16.0 (0.0) |
| IS | 15.8 (0.5) | 15.2 (0.6) | 17.7 (1.0) | 15.5 (0.1) | 14.9 (0.1) | 16.8 (0.0) |
| LS | 14.1 (0.5) | 13.3 (0.9) | 16.1 (0.7) | 14.1 (0.0) | 13.2 (0.1) | 16.2 (0.1) |
| Number of REM Episode | ||||||
| SS | 57 (2.2) | 38 (1.7) | 19 (1.3) | 56 (1.3) | 37 (1.2) | 19 (1.2) |
| IS | 59 (2.2) | 41 (1.7) | 18 (1.1) | 64 (2.6) | 42 (2.0) | 22 (1.7) |
| LS | 62 (1.6) | 41 (1.7) | 22 (1.4) | 64 (1.9) | 40 (2.4) | 24 (1.1) |
| Average REM Episode Length | ||||||
| SS | 1.6 (0.04) | 1.7 (0.07) | 1.3 (0.06) | 1.6 (0.05) | 1.8 (0.07) | 1.3 (0.02) |
| IS | 1.7 (0.04) | 1.8 (0.05) | 1.4 (0.04) | 1.6 (0.05) | 1.7 (0.06) | 1.3 (0.04) |
| LS | 1.6 (0.05) | 1.7 (0.08) | 1.5 (0.08) | 1.5 (0.05) | 1.6 (0.07) | 1.3 (0.08) |
| Total Motor activity Count | ||||||
| SS | 36469 (5053) a | 7712 (1391) a | 28757 (3738) a | 36303 (4416) a | 8377 (1615) a | 27926 (2979) a |
| IS | 28082 (2783) ab | 5305 (617) ab | 22777 (2275) ab | 28385 (2617) ab | 6180 (655) ab | 22205 (2138) ab |
| LS | 22087 (2579) b | 4081 (731) b | 18006 (1999) b | 20067 (1919) b | 3895 (678) b | 16172 (1293) b |
| Average Motor activity Count in Each Waking Min | ||||||
| SS | 44 (4.4) a | 29 (4.6) | 55 (5.9) a | 44 (5.8) a | 32 (6.8) | 50 (5.6) a |
| IS | 34 (3.3) ab | 22 (2.5) | 40 (3.8) ab | 36 (3.4) ab | 26 (2.9) | 40 (3.7) ab |
| LS | 30 (3.3) b | 20 (3.6) | 34 (3.5) b | 27 (2.8) b | 18 (3.3) | 31 (2.6) b |
| Ratio (L/D) | Total Sleep | NREM | REM | Total Sleep | NREM | REM |
| SS | 3.0 (0.25) | 3.1 (0.27) | 2.8 (0.42) | 2.9 (0.08) | 3.0 (0.11) | 2.9 (0.34) |
| IS | 3.3 (0.17) | 3.4 (0.18) | 3.0 (0.26) | 2.9 (0.15) | 3.0 (0.14) | 2.9 (0.41) |
| LS | 2.7 (0.13) | 2.7 (0.13) | 2.3 (0.29) | 2.6 (0.11) | 2.6 (0.11) | 2.2 (0.37) |