Chronic insomnia often persists through behaviours intended to protect sleep.
Sleepiness on the sofa followed by alertness in the bedroom suggests conditioned arousal and should prompt stimulus control.
The instinctive response to poor sleep is often to protect it: go to bed earlier, stay there longer, nap during the day and keep trying until sleep comes. In chronic insomnia, those behaviours can maintain the problem long after the original stressor has settled.
That distinction matters because acute insomnia and chronic insomnia are not the same clinical problem. Chronic insomnia combines difficulty falling asleep, repeated waking or early waking with daytime impairment, occurring at least three days each week for more than three months. Depression, anxiety, post-traumatic stress, pain or physical illness may coexist, but improvement in the comorbidity does not guarantee that the insomnia will resolve.
The assessment therefore needs to move beyond a simple estimate of hours slept. A subjective sleep diary records when the patient gets into bed, when they intend to sleep, sleep latency, awakenings, early waking, total sleep time, final wake time and get-up time. Naps, caffeine, alcohol and medication also matter. The diary supplies the data used to prescribe treatment and judge whether it is working.
Time-in-bed restriction and stimulus control
Time-in-bed restriction sounds counterintuitive because it reduces the sleep opportunity before expanding it. It is not a permanent reduction in sleep. The initial sleep window is matched to the amount of sleep actually obtained, which increases sleep drive and consolidates sleep. As sleep becomes consolidated, the window expands gradually.
Stimulus control addresses a different part of the cycle. A patient who feels sleepy on the sofa but alert on entering the bedroom may have developed conditioned arousal. The bed has become associated with wakefulness, worry, reading and effort rather than sleep. Reserving it for sleep and sex, leaving when wakefulness persists and returning when sleepy begins to reverse that association.
These interventions demand explanation. Describing time-in-bed restriction as permanent sleep deprivation can undermine adherence. Handing over a sleep diary without teaching the entries is equally weak. Review the diary at each session, solve barriers to completion and address fears about the behavioural prescription.
Before reaching for medication, assess perpetuating behaviours and other sleep disorders. CBT-I remains an active treatment when psychiatric or physical illness coexists; it does not need to wait for those conditions to disappear.
For the patient spending longer and longer in bed but sleeping less, the next useful step is a diary, a defined sleep window and a plan to leave the bed when wakefulness persists.
Preparation for the European Exam in Core Cardiology extends beyond factual recall. Device checks, staged question review, multimodality imaging, detailed management steps and post-exam memory bias shape both performance and later judgement of the result.
Recurrent headache may signal late-onset urea cycle disease and can justify plasma ammonia testing in selected patients. Wider themes include rare-disease registries, multidisciplinary training, palliative care, personalised gene editing and clinically validated AI-supported case finding.
Chronic insomnia can persist through extended time in bed, napping and conditioned arousal even after the original stressor improves. A subjective sleep diary guides time-in-bed restriction and stimulus control, including when psychiatric or physical illness coexists.
Ask patients with persistent insomnia to separate the time they enter bed from the time they intend to sleep. Record sleep latency, awakenings, early waking, total sleep time, naps, caffeine, alcohol and medication in a subjective diary. Assess conditioned arousal and other sleep disorders before reaching for medication or waiting for a comorbidity to resolve.
An adult has difficulty falling asleep and wakes repeatedly on four nights each week. The symptoms have lasted five months and cause daytime tiredness, irritability and poor concentration. The original stressor has improved, but the sleep problem remains. What diagnosis best fits this pattern?
Chronic insomnia disorder. It combines difficulty initiating or maintaining sleep, or early waking, with daytime impairment on at least three days each week for more than three months.
An adult becomes sleepy while sitting on the sofa but feels alert after entering the bedroom. Prolonged wakefulness, reading and worry then occur in bed. Which behavioural instruction most directly addresses this conditioned arousal?
Leave the bed when wakefulness persists and return when sleepy. Reserve the bed for sleep and sex so that it becomes associated with sleep rather than wakefulness.
An adult with an ornithine transcarbamylase variant develops recurrent severe headaches and unexplained episodic symptoms. Routine neurological imaging and standard blood tests are unrevealing. Which investigation most directly assesses the suspected metabolic abnormality?
Plasma ammonia measurement. Recurrent headache can occur in late-onset urea cycle disease, and selected patients require assessment for hyperammonaemia.
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