Patient clinical and demographic characteristics
| Patient characteristic | Usual care n=30 | Sleep protocol n=26 |
| Age, years: mean±SD | 63.5±17.7 | 61.0±15.7 |
| Non-white: n (%) | 8 (27%) | 5 (20%) |
| Women: n (%) | 17 (57%) | 17 (68%) |
| Full code: n (%) | 27 (90%) | 23 (92%) |
| APACHE II: mean±SD | 19.5±6.9 | 19.0±6.9 |
| Admitted from ER: n (%) | 28 (93%) | 19 (79%) |
| Hours from hospital admission until enrollment:: mean±SD | 32.2±8.0 | 31.3±8.7 |
| Hours from ICU admission until enrollment: mean±SD | 25.6±7.2 | 26.2±8.0 |
| Delirious on enrolment: n (%)* | 14/27 (52%) | 9/20 (43%) |
| MICU admission, sepsis: n (%) | 10 (33%) | 3 (12%) |
| MICU admission, acute respiratory failure: n (%) | 7 (23%) | 7 (28%) |
| Vasopressors: n (%) | 11 (37%) | 3 (12%) |
| Mechanical ventilation: n (%) | 9 (30%) | 8 (32%) |
| MICU LOS, days: mean±SD | 4.3±3.4 | 4.1±2.9 |
| Hospital LOS, days: mean±SD | 10.1±9.1 | 9.3±9.4 |
| Death in hospital: n (%) | 4 (13%) | 2 (8%) |
*A total of 47 of 56 patients able to be assessed for delirium.
APACHE II, Acute Physiology and Chronic Health Evaluation II; ER, emergency room; ICU, intensive care unit; LOS, length of stay; MICU, medical ICU.