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Percentages of Wakefulness and Sleep Stages by Visual Scoring of a 48-h Period in 5 Animals. Undisturbed Animals Slept for 46% of the 24 h, Including 89% of the Dark Period and One-Fourth of the Light Period.
| Total time (100%) | Time in sleep (100%) |
|||||
|---|---|---|---|---|---|---|
| Asleep | S1 | S2 | S3 | S4 | REM | |
| 24-h | ||||||
| Mean | 46.4 | 15.8 | 40.2 | 11.3 | 9.7 | 23.0 |
| SD | 3.6 | 6.7 | 5.9 | 2.0 | 4.5 | 7.6 |
| Light | ||||||
| Mean | 25.2 | 26.5 | 34.5 | 8.3 | 5.5 | 25.2 |
| SD | 5.2 | 15.7 | 9.4 | 5.1 | 6.5 | 14.1 |
| Dark | ||||||
| Mean | 89.2 | 10.3 | 43.6 | 13.0 | 11.8 | 21.4 |
| SD | 1.3 | 4.4 | 8.0 | 4.3 | 5.7 | 6.2 |
