Classification of circadian rhythm sleep disorders (CRSD) CRSD Primary disorders: (1) Delayed sleep phase
(2) Advanced sleep phase (3) Sleep-wake cycle irregular pattern (4) Non 24-h sleep-wake cycle Secondary disorders: (5) Jet lag (6) CRSD secondary to work at irregular hours (7) CRSD secondary to diseases (8) CRSD secondary to the use of drugs or medications Other: (9) Other CRSDs Source: Ref.
Differences reported between weekday and weekend sleep raise concern that students may exhibit symptoms of delayed sleep phase
syndrome, a circadian rhythm disorder that can result in excessive morning drowsiness and difficulty falling asleep on weeknights (Buboltz et al., 2001).
Persons with delayed sleep phase
disorder (DSPD) live at a delayed phase that resists advancement and is incompatible with their personal and social obligations.
This may be manifested: by an erratic sleep/ wake cycle; by a delayed sleep phase
so that a person goes to sleep very late in the night and awakens late in the morning; or by an advanced sleep phase so that a person wakes up very early in the morning and goes to sleep early at night.
Some people with advanced or delayed sleep phase
syndrome benefit from phototherapy, a treatment in which you are exposed to bright lights at certain times of the day to reset your circadian clock.
A randomized controlled trial of cognitive-behavior therapy plus bright light therapy for adolescent delayed sleep phase
Adolescents who consistently do not feel refreshed when they awaken in the morning may experience a delayed sleep phase
pattern consisting of symptoms of daytime sleepiness that contribute to a decline in well-being (Carskadon, 1990; Carskadon et al.
Prevalence of delayed sleep phase
syndrome in university students.
Actigraphy can help with the evaluation of circadian rhythm sleep disorders, like delayed sleep phase
syndrome, advanced sleep phase syndrome and shift work.
Kripke, "Evaluation of two circadian rhythm questionnaires for screening for the delayed sleep phase
disorder," Psychiatry Investigation, vol.
As a result of Billy's broken sleep, he had been suffering from 'delayed sleep phase
syndrome' - a disorder where sleep is delayed two or more hours past the conventional bedtime.
Billy's broken sleep led to "delayed sleep phase
syndrome", causing behaviour and concentration problems.