Journal
JOURNAL OF CLINICAL SLEEP MEDICINE
Volume 14, Issue 1, Pages 31-39Publisher
AMER ACAD SLEEP MEDICINE
DOI: 10.5664/jcsm.6874
Keywords
actigraphy; cancer; fatigue; light therapy; sleep disturbance; sleep efficiency; sleep quality
Categories
Funding
- National Cancer Institute of the National Institutes of Health [R21CA158954, K05CA108955, 5K07CA184145-03]
- Danish Council of Independent Research [DFF - 5053-00220]
Ask authors/readers for more resources
Study Objectives: Sleep disturbances are commonly reported by cancer survivors. Systematic light exposure using bright light has been used to improve sleep in other populations. In this secondary data analysis, the effect of morning administration of bright light on sleep and sleep quality was examined in a mixed group of fatigued cancer survivors. Methods: Forty-four cancer survivors screened for cancer-related fatigue were randomized to either a bright white light or a comparison dim red light condition. Participants were instructed to use a light box every morning for 30 minutes for 4 weeks. Wrist actigraphy and the Pittsburgh Sleep Quality Index were administered at 4 time points: prior to light treatment (baseline), 2 weeks into the intervention, during the last week of the intervention, and 3 weeks postintervention. Thirty-seven participants completed the end-of-intervention assessment. Results: Repeated-measures linear mixed models indicated a statistically significant time x treatment group interaction effect with sleep efficiency improving more in the bright light condition over time compared with the dim light condition (F-3,F-42 = 5.55; P = .003) with a large effect size (partial eta(2) = 0.28). By the end of the intervention and 3 weeks postintervention, mean sleep efficiency in the bright light group was in the normal range. Medium to large effect sizes were also seen in sleep quality, total sleep time, and wake after sleep onset for participants favoring the bright light condition. Conclusions: The results suggest that systematic bright light exposure in the morning may have beneficial effects on sleep in fatigued cancer survivors. Larger scale efficacy trials are warranted.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available