Phase-shifting effects of bright morning light as treatment for delayed sleep phase syndrome.

@article{Rosenthal1990PhaseshiftingEO,
  title={Phase-shifting effects of bright morning light as treatment for delayed sleep phase syndrome.},
  author={Norman Edward Rosenthal and J R Joseph-Vanderpool and A A Levendosky and Stuart H. Johnston and Richard Allen and Keith A. Kelly and E. Sou{\^e}tre and Pauline M Schultz and K E Starz},
  journal={Sleep},
  year={1990},
  volume={13 4},
  pages={354-61}
}
Bright light has recently been shown to have phase-shifting effects on human circadian rhythms. In this study we applied this effect to 20 patients with delayed sleep phase syndrome (DSPS) who were unable to fall asleep at conventional clock times and had a problem staying alert in the morning. In a controlled treatment study, we found that 2 h of bright light exposure in the morning together with light restriction in the evening successfully phase advanced circadian rhythms of core body… CONTINUE READING