Risk Factors
In addition to adolescent, young adult, and older age, certain environmental and behavioral factors pose risks for DSPS. Persons who watch television, perform computer work, or play video games during late night hours are at risk. Reduced morning light exposure or excessive light exposure in the evening increases risk of DSPS. Persons who work the afternoon or night shift and those who frequently travel through several time zones can develop complicated sleep patterns that can progress to DSPS.