C. Czeisler, J. Allan, S. Strogatz, J. Ronda, R Sanchez, C. Rios, W. Freitag, G. Richardson, R. Kronauer,
Bright light resets the human circadian pacemaker independent of the timing of the sleep-wake cycle. Science. ,vol. 233, pp. 667- 671 ,(1986) ,
10.1126/SCIENCE.3726555