A report in Science Daily referred to a study done on a group of subjects, half with visual impairment some of this group had optic nerve damage, and the other group had normal vision. The subjects were monitored for period of two weeks during their waking and sleeping times.
It was found that the subjects who had visual impairment as a result of optic nerve damage were far more likely to suffer from excessive daytime sleepiness than the subjects who had normal vision. Also subjects with optic nerve damage were far more likely to have excessive daytime sleepiness than those who were visually impaired, but did not have optic nerve damage.
The conclusion drawn by the researchers from this study was the importance of the role vision has in controlling circadian rhythms.
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