II. Definitions
- Late sleep onset as well as late wake-up time
- Results in excessive Daytime Sleepiness and Insomnia
III. Epidemiology
- Prevalence: 7-16% of adolescents
- Onset in teen years with peak Incidence in early 20s
- Family History of Delayed Sleep Phase in 40% of patients
IV. Symptoms
- Shifted sleep schedule by at least 2 hours later that typical acceptable times
- Patient has a "night owl" sleep pattern
- Difficulty initiating sleep (e.g. prior to 1-2 am)
- Difficulty waking up by typical awakening times (e.g. prior to noon)
V. Diagnosis
-
Sleep diary
- Log sleep times before and after intervention
- Actigraphy monitoring for at least 1 week
- Accelerometer monitors patients overnight movement
- Calculates actual patient sleep time
VI. Management
- See Sleep Hygiene
- See Insomnia
- Melatonin 3 mg orally at least 1.5 hours prior to desired bedtime
- Limit bright light exposure prior to bedtime
- Avoid computers, handheld devices, television watching before bed
- Bright Light Therapy on awakening
- Exposure to 2000 lux for first 1-2 hours after awakening
- Transitioning to optimal sleep timing
- Shift Melatonin/light exposure 1 hour earlier every 5-7 days until desired schedule is achieved
VII. References
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| Concepts | Disease or Syndrome (T047) |
| Italian | Fase del sonno ritardata |
| Japanese | 遅延睡眠期, ﾁｴﾝｽｲﾐﾝｷ |
| Czech | Pozdní fáze spánku |
| English | Delayed sleep phase, delay phase sleep, delayed sleep phase |
| Hungarian | Késleltetett alvásfázis |
| Portuguese | Atraso de fase do sono |
| Spanish | Fase de sueño retrasada |
| Dutch | vertraagde slaapfase |
| French | Phase de sommeil retardée |
| German | verzoegerte Schlafphase |
