Full
Outline
To investigate the cross-sectional association between bedroom nocturnal light exposure and objectively measured sleep parameters in college students, so as to provide evidence for promoting sleep health.
From September to October 2019, a convenience sampling method was used to recruit 365 healthy college students from two universities in Hefei, establishing a cohort. Bedroom nocturnal light exposure was measured at the individual level for two consecutive days using a portable illuminometer (TES-1339R; Taishi Corp, Taiwan, China). Sleep parameters were objectively measured over seven consecutive days using wrist-worn accelerometers (ActiGraph GT3X-BT, Pensacola, FL). Multiple linear regression models were employed to examine the association between nocturnal light exposure and sleep parameters.
Compared to the low nocturnal light exposure (< 3 lx) group, the high-exposure (≥3 lx) group exhibited significantly lower sleep efficiency[(93.5±2.7)%, (92.2±2.9)%, t=3.93], longer wake after sleep onset (WASO)[(24.7±90.3)(29.2±11.2)min, t=-3.66], higher movement index(11.0±3.6, 12.2±3.8, t=-2.80), and higher sleep fragmentation index(20.5±6.5, 23.0±7.0, t=-3.24) (all P < 0.01). After adjusting for covariates, multiple linear regression showed that, compared to the low nocturnal light exposure group, the high-exposure group had reduced sleep efficiency (β=-1.15, 95%CI=-1.78 to -0.52), increased WASO [β(95%CI)=3.94(1.55-6.33)], higher movement index[β(95%CI)=1.05(0.20-1.89)], and elevated sleep fragmentation index[β(95%CI)=2.35(0.81-3.88)](all P < 0.05).
Light exposure at night negatively impacts college students' sleep. Optimizing bedroom lighting management may improve sleep quality in adolescents.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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