Effects of Bright Light with Reduced Blue Light on Sleepiness on Rising: A Small Exploratory Study

Table 2

Effects of the interventions on the mean scores for Oguri–Shirakawa–Azumi sleep inventory factors I to V. Factor I is “sleepiness on rising,” factor II “initiation and maintenance of sleep,” factor III “frequent dreaming,” factor IV “refreshing,” and factor V “sleep length.” Data are presented as mean ± S.D.

Intervention	Day	Factor I; (n=6)	Mean Factor I	P vs; No light
No light	1	43.8 ± 5.4	39.1 ± 7.5	−
	2	38.2 ± 8.1
	3	37.6 ± 8.3
	4	36.6 ± 7.7
50%-cut	5	42.1 ± 9.2	43.1 ± 9.9	0.209
	6	42.5 ± 11.5
	7	43.0 ± 7.7
	8	45.0 ± 12.9
30%-cut	9	51.6 ± 8.7	48.2 ± 8.7	0.003
	10	46.6 ± 10.3
	11	48.0 ± 8.5
	12	46.7 ± 8.5
Intervention	Day	Factor II; (n=6)	Mean Factor II
No light	1	41.7 ± 10.7	40.8 ± 9.8
	2	39.2 ± 6.1
	3	44.2 ± 13.3
	4	38.1 ± 9.0
50%-cut	5	40.7 ± 5.6	40.5 ± 8.2
	6	34.1 ± 7.0
	7	42.7 ± 8.6
	8	44.5 ± 9.1
30%-cut	9	40.0 ± 10.2	42.8 ± 10.1
	10	47.7 ± 9.6
	11	44.2 ± 11.1
	12	39.2 ± 9.9
Intervention	Day	Factor III (n=6)	Mean Factor III
No light	1	50.4 ± 12.6	49.2 ±11.7
	2	50.4 ± 12.6
	3	51.5 ± 11.6
	4	44.3 ± 11.8
50%-cut	5	54.9 ± 8.2	53.8 ± 8.8
	6	53.4 ± 12.2
	7	56.2 ± 5.5
	8	50.7 ± 9.3
30%-cut	9	53.4 ± 8.4	51.3 ± 11.6
	10	53.2 ± 9.3
	11	49.3 ± 14.8
	12	49.3 ± 14.8
Intervention	Day	Factor IV (n=6)	Mean Factor IV
No light	1	42.8 ± 8.4	41.6 ± 7.6
	2	41.5 ± 6.2
	3	40.1 ± 9.7
	4	38.8 ± 8.6
50%-cut	5	43.3 ± 10.0	42.5 ± 7.7
	6	33.7 ± 7.4
	7	45.2 ± 6.2
	8	40.1 ± 11.2
30%-cut	9	44.1 ± 6.0	45.1 ± 6.7
	10	40.1 ± 6.3
	11	48.1 ± 8.1
	12	44.1 ± 8.1
Intervention	Day	Factor V (n=6)	Mean Factor V
No light	1	42.8 ± 8.4	40.8 ± 7.9
	2	38.8 ± 8.6
	3	45.2 ± 6.2
	4	40.1 ± 6.3
50%-cut	5	41.5 ± 6.2	40.6 ± 9.4
	6	43.3 ± 10.0
	7	40.1 ± 11.2
	8	48.1 ± 8.1
30%-cut	9	40.1 ± 9.7	44.1 ± 7.3
	10	33.7 ± 7.4
	11	44.1 ± 6.0
	12	44.1 ± 8.1