Table 3.
Minutes of Sleep During Each Two-Hour Interval of a 12-Hour Night Shift
| Time | Night 1
|
Night 2
|
Night 3
|
||||||
|---|---|---|---|---|---|---|---|---|---|
| X̄ | SD | Range | X̄ | SD | Range | X̄ | SD | Range | |
| 7–8:59 pm | 29.6 | 40.7 | 0–105 | 19.2 | 25.8 | 0–72 | 10.3 | 26 | 0–94 |
|
| |||||||||
| 9–10:59 pm | 48.3 | 51.7 | 0–114 | 39.2 | 38 | 0–96 | 46.8 | 42.5 | 0–115 |
|
| |||||||||
| 11 pm–12:59 am | 81.5 | 34.3 | 15–120 | 86.3 | 26.3 | 35–119 | 80.4 | 39 | 0–111 |
|
| |||||||||
| 1–2:59 am | 103.5 | 11.4 | 15–120 | 103.2 | 22.4 | 29–120 | 92.2 | 25.5 | 43–120 |
|
| |||||||||
| 3–4:59 am | 106.5 | 8.2 | 84–116 | 106.6 | 11.4 | 79–120 | 104 | 12.1 | 78–117 |
|
| |||||||||
| 5–6:59 am | 106.5 | 9.1 | 89–119 | 103.9 | 14.2 | 66–116 | 104 | 12.6 | 79–120 |