Insomnia is difficulty falling asleep, staying asleep, or waking earlier than intended, occurring despite adequate opportunity to sleep and causing daytime consequences such as fatigue, irritability, or trouble concentrating.
Because insomnia is frequently driven by an underlying issue such as pain, an untreated mood or anxiety condition, sleep apnoea, or a medication, evaluation matters. National Institutes of Health resources describe cognitive behavioural therapy for insomnia as a first-line approach for chronic insomnia.