Table 2 Visually scored sleep stages
| Â | Blue light exposure | No light | p value |
|---|---|---|---|
Sleep | |||
 TIB, min | 480.0 | 480.0 |  |
 TST, min | 448.1 ± 3.3 | 452.9 ± 3.6 | NS |
 SE, % | 93.4 ± 0.7 | 94.5 ± 0.8 | NS |
 Stage 1, min | 49.4 ± 6.0 | 41.6 ± 4.8 | NS |
 Stage 2, min | 248.9 ± 12.1 | 250.7 ± 14.7 | NS |
 SWS, min | 54.2 ± 8.0 | 59.6 ± 7.8 | NS |
 REM, min | 96.9 ± 13.4 | 103.2 ± 12.8 | NS |
 NREM, min | 351.2 ± 13.8 | 349.7 ± 12.9 | NS |
 WASO, min | 21.1 ± 2.4 | 18.2 ± 3.2 | NS |
 SL, min | 8.6 ± 2.8 | 5.9 ± 1.4 | NS |
 RL, min | 96.1 ± 12.1 | 108.2 ± 19.2 | NS |
In the following morning | Â | Â | Â |
 Stage 1 and 2, min | 26.0 ± 9.8 | 6.3 ± 2.7 | <0.05 |