AASM	American Academy of Sleep Medicine
BZRA	benzodiazepine receptor agonist
CBT-I	cognitive behavioural therapy for insomnia
CI	confidence interval
CNS	central nervous system
DALYs	disability-adjusted life year
DSM	diagnostic and statistical manual of mental disorders
ESRS	European Sleep Research Society
GP	general practitioner
HCP	healthcare professionals
HR	hazard ratio
ICD	international classification of diseases
ICSD	international classification of sleep disorders
MAOI	monoamine oxidase inhibitor
NHS	National Health Service
OR	odds ratio
PPP	purchasing power parities
SL	sleep latency
SSRI	selective serotonin reuptake inhibitor
TCA	tricyclic antidepressant
TST	total sleep time
WASO	wakefulness after sleep onset