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Protocols of the intervention.
| Group | Preintervention period (2 weeks) | Intervention period (30 days) |
| SWLa: optical SWL filters | Sleep diary | Sleep diary, goggles |
| OMb | Sleep diary | Sleep diary, OM |
| SWL+OM: optical SWL filters and OM | Sleep diary | Sleep diary, goggles, OM |
| Control: no intervention | Sleep diary | None |
aSWL: short-wavelength light.
bOM: oral melatonin.
