Table 1 –
Sleep characteristics of day-shift and night-shift nurses (measured via actigraphy).
| Group | Sleep Duration (min) | Sleep Efficiency (%) | % Wake (after sleep onset) | Activity Counts/min (During Sleep) | Fragmentation Index | Midsleep Time (in decimal hrs) |
|---|---|---|---|---|---|---|
| Days Off |
||||||
| Day (n = 8) | 448 (41) | 80.2 (8.6) | 9.6 (3.6) | 12.6 ( 6.4) | 16.4 ( 6.4) | 3.2 (1.0) |
| Night (n = 9) | 475 (61) | 76.6 (9.9) | 10.7 (4.0) | 20.8 (15.1) | 27.7 (31.5) | 3.4 (1.3) |
| Naps on Days Off |
||||||
| Day (n = 5) | 119.4 (95) | 64.6 (20.7) | 2.7 (3.9) | 6.7 (4.7) | 7.9 (5.6) | |
| Night (n = 9) | 190.4 (73) | 78.4 ( 9.6) | 7.0 (4.0) | 15.9 (12.0)* | 23.5 (20.3) | |
| Work Days |
||||||
| Day (n = 8) | 440 (79) | 83.4 (8.0) | 7.9 (4.9) | 11.1 ( 9.4) | 14.6 (9.0) | |
| Night (n = 9) | 326 (85)* | 79.5 (4.9) | 6.5 (4.4) | 18.6 (15.1) | 30.0 (32.5) |