National Sleep Foundation

Chapter 5: Circadian Rhythm Sleep Disorders


Assessment and diagnosis of delayed sleep phase disorder (DSPD)

Similar clinical assessment is required of all circadian rhythm sleep disorders.  Prior to a diagnosis of DSPD, patients presenting with a complaint of delayed sleep need to be differentiated from those with other sleep-onset problems (to rule out anxiety, stress, or restless legs syndrome).1
DSPS, occurring most common in adolescents, can negatively affect school performance.2


  1. AmericanAcademy of Sleep Medicine. The international classification of sleep disorders: diagnostic and coding manual. 2nd ed. Westchester, Ill: American Academy of Sleep Medicine; 2005.
  2. Pagel JF, Forister N, Kwiatkowski C. (2007) Adolescent Sleep Disturbance and School Performance: The confounding variable of socioeconomics, Journal of Clinical Sleep Medicine 3 (1):19-23.