Sleep
SE
Sleep quality and sleep duration was generally low in this population, only 31% felt they slept well. Mean time in bed assessed by accelerometers was only 5.4 h (SD 1.3) and mean sleep time 4.8 h (SD 1.2). 81% slept less than 6 h per night, usually considered as an insufficient amount of sleep. Accelerometer-based number of awakenings (NOFA) after sleep onset was 14 on average (SD 5) and mean time wake after sleep onset (WASO) was 34 min (SD 13). Sleep efficiency (SE) was 89% on average.Following the intervention, 61% (22 out of 36) of the participants in the Nature-group experienced a positive change in perceived sleep (z = −3.78, 