Figure 1.

Disturbance factors before and after the sleep-promotion intervention. Solid bars are pre-intervention; hatched bars are post-intervention. “No lights” indicates that no artificial lights were on in the patient’s room. “Bright lights” indicates use of either the headboard or procedure lights, which are the brightest lights in patient rooms. “Door open” indicates that the room door was open enough to allow someone to walk unimpeded into the room. “Door curtain open” indicates that a room had its curtain more than halfway open. “Window shade open” indicates that a room had its shade at least halfway open.