As a result of the lower amplitude of the light/dark cycle, participants with irregular sleep tended to have a delayed secretion of melatonin when compared to the participants with regular sleep.

California Polytechnic State University, San Luis Obispo

Irregular sleepers had less exposure to light during the day compared to regular sleepers. Irregular sleepers also had a smaller difference between the amount of light they were exposed to during the day and during the night. This suggests that the circadian rhythms of irregular sleepers is delayed.

Irregular Sleep and Light/Dark Cycle

Phillips, A. J. K., Clerx, W. M., O’Brien, C. S. et al. Irregular sleep/wake patterns are associated with poorer academic performance and delayed circadian and sleep/wake timing. Sci Rep 7, 3216 (2017). https://doi.org/10.1038/s41598-017-03171-4

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