At what age does DSPS begin to show up?
Many DSPS patients report that their difficulties began after a period of late night studying or partying, or after employment on the evening or night shift. Following these activities, they found it impossible to sleep on a normal schedule even when they resumed normal work or school hours. Adolescence appears to be the most common period of life for the onset of DSPS, but childhood cases have been reported. It is rare for it to begin after age 30.
