Last reviewed: June 2020
Last updated: November  2018



History and exam

Key diagnostic factors

  • presence of risk factors
  • snoring, gasping, choking while asleep (obstructive sleep apnoea)
  • night sweats (obstructive sleep apnoea)
  • breathing through an open mouth (obstructive sleep apnoea)
  • sleeping with hyperextended neck (obstructive sleep apnoea)
  • restless sleep and periodic limb movements (obstructive sleep apnoea)
  • secondary nocturnal enuresis (obstructive sleep apnoea)
  • hypertension (obstructive sleep apnoea)
  • inability to fall asleep (sleep association disorder)
  • cataplexy (narcolepsy)
  • hypnagogic or hypnopompic hallucinations (narcolepsy)
  • sleep paralysis (narcolepsy)
  • erratic sleep schedule (delayed sleep phase disorder/syndrome)

Other diagnostic factors

  • excessive daytime sleepiness
  • difficulty awakening in the morning
  • sleep walking or talking (obstructive sleep apnoea)
  • sleep attacks (narcolepsy)
  • refusal to sleep in own bedroom (sleep association or limit-setting disorder)

Risk factors

  • craniofacial abnormalities (obstructive sleep apnoea)
  • adenotonsillar hypertrophy (obstructive sleep apnoea)
  • macroglossia (obstructive sleep apnoea)
  • gastro-oesophageal reflux (obstructive sleep apnoea)
  • allergic rhinitis (obstructive sleep apnoea)
  • environmental tobacco smoke exposure (obstructive sleep apnoea)
  • obesity (obstructive sleep apnoea)
  • hypotonia (obstructive sleep apnoea)
  • alcohol (obstructive sleep apnoea)
  • medications (obstructive sleep apnoea)
  • Down's syndrome (obstructive sleep apnoea)
  • evening light exposure (delayed sleep phase disorder/syndrome)
  • inconsistent parenting style (limit-setting disorder)
  • age <6 years (behavioural insomnia of childhood or obstructive sleep apnoea)
  • adolescent age (delayed sleep phase disorder/syndrome)
  • distractions in bedroom (delayed sleep phase disorder/syndrome)

Diagnostic investigations

1st investigations to order

  • sleep diary
  • polysomnogram (PSG)
  • multiple sleep latency test (MSLT)
More 1st investigations to order

Investigations to consider

  • lateral neck films
  • nasal endoscopy
  • overnight oximetry
  • actigraphy
  • audiovisual recording
  • HLA typing
More investigations to consider

Emerging tests

  • pneumogram
  • CSF hypocretin levels
More emerging tests

Treatment algorithm


Associate Medical Director

Center for Pediatric Sleep Disorders

Boston Children's Hospital

Assistant Professor of Pediatrics

Harvard Medical School




DR declares that he has no competing interests.

Peer reviewersVIEW ALL

Consultant in Paediatric Neurodisability

Evelina Children's Hospital

St Thomas' Hospital




PG is lead applicant on the ongoing MENDS trial, which is concerned with the use of melatonin in children with neurodevelopmental disorders and impaired sleep.

Associate Professor of Pediatrics

Division of Pediatric Pulmonary & Sleep Medicine

University of Chicago




LKG is an author of a number of references cited in this monograph.

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