You are currently viewing Delayed Sleep-Wake Phase Disorder Mnemonic

Here is a quick mnemonic “NORMAL SLEEP to remember about Delayed Sleep-Wake Phase Disorder

This can be valuable for patients as well as medical doctors, nurses & students doing their clinical rounds. You can also find it very useful for med exams like USMLE, MBBS, NEET PG, FMGE, NExT, MCAT & NCLEX exams

Delayed Sleep-Wake Phase Disorder : How To Remember Easily ?

  • N – Nearly the same sleep times at clock hours daily
  • O – On polysomnography, sleep appears normal (except for delayed sleep onset)
  • R – Research shows about half of DSWPD patients have an abnormally delayed circadian phase
  • M – Melatonin secretion onset occurs later in the evening than normal
  • A – Assessing melatonin onset helps evaluate circadian phase delay
  • L – Light suppression of melatonin secretion is observed in a dimly lit environment
  • S – Sleep onset and wake times persistently occur later than desired
  • L – Late onset of dim-light melatonin secretion distinguishes DSWPD from other forms of sleep-onset insomnia
  • E – Evening administration of melatonin and morning phototherapy with blue-enriched light show promise in treatment
  • E – Excessive exposure to artificial light may contribute to circadian phase delay
  • P – Patients with DSWPD tend to be young adults


Dr. Arin Nandi

Passionate About Medical Science & Helping Future Doctors Achieve Top Ranks In Medical Exams. He is professionally a dentist as well as a public health expert from JIPMER (1), (2)working in health department