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Table 3 Classification of insomnia: Important featuresa

From: Clinician and patient barriers to the recognition of insomnia in family practice: a narrative summary of reported literature analysed using the theoretical domains framework

FeaturesClassificationClinical note(s)Further classification or notes
Duration of symptoms
 Acute/Short-term (ICD-3)Symptoms last < 3 monthsTypically lasts 1 night to a few weeks. May result from illness or a circadian rhythm disturbance such as jet-lag
Chronic (ICD-3)/Insomnia disorder (DSM-5)Symptoms last > 3 monthsUsually trouble sleeping is reported 3+ nights for > 3 months
Timing
 OnsetFalling asleep takes > 30 min 
MaintenanceInterruptions lasting more than 30–45 min are experienced during the night 
Early terminationWaking earlier than intended & unable to resume sleep 
Severity
 MildAlmost nightly complaintlittle or no impairment on social or occupational functions
ModerateNightly complaintMild-moderate impairment on social/occupational functions
SevereNightly complaintSevere impact on social/occupational functions
  1. aFurther information on these issues is provided by [1, 2, 49,50,51,52]