1. Sleep pressure and the body clock have different roles

NHLBI’s sleep guidance distinguishes the need for sleep that builds during wakefulness from the body clock’s alignment with light and darkness. Adenosine is linked to sleep need, but insomnia does not by itself establish an individual adenosine deficit or one faulty brain circuit. Sleepiness, attempted sleep timing and difficulty sleeping need to be considered together.

2. CBT-I is more specific than advice to sleep well

AASM’s adult patient guide describes CBT-I as addressing thoughts and behaviors that affect sleep. Stimulus control reconnects bed and bedroom with sleep; sleep restriction sets planned limits on time in bed. Relaxation and sleep education are also discussed. This explains reviewing behaviors such as prolonged wakefulness in bed while trying harder to sleep. Persistent insomnia despite basic sleep-hygiene changes can warrant discussion of structured treatment.

3. A diary is an estimate, not an objective sleep study

NHLBI’s diagnostic guidance suggests that one to two weeks of entries before a visit may help. Record bedtime, waking, naps, daytime sleepiness, caffeine/alcohol and exercise timing. Mark uncertain sleep onset as estimated. A diary does not measure brain-wave sleep stages or objectively establish when you were asleep.

Sleep efficiency is estimated time asleep divided by time in bed. For a fictional eight hours in bed and six hours estimated asleep, 6 ÷ 8 × 100 = 75%. This illustrates arithmetic, not a diagnosis, treatment success/failure or an instruction to limit the next night to six hours in bed. Neither one number nor an 85% boundary determines health.

4. Turn an entry into clinical questions

A fictional entry might say “16 October / bed23:00, up07:00 / sleep onset unknown / estimated six hours asleep / afternoon sleepiness / coffee15:00 / nap30minutes.” It establishes neither a cause nor a treatment effect. Ask which patterns will be assessed, how to access CBT-I in person/by telephone/online, and which adjustments fit current medicines and conditions.

5. Confirm the plan and safety together

NHLBI’s treatment guidance explains CBT-I components and delivery. AASM advises considering daytime sleepiness and other conditions when selecting treatment. Sleep restriction is not a challenge to cut sleep dramatically on your own. Review the schedule, response and daytime functioning with the provider, and do not stop or increase medicines independently. Treatment does not guarantee immediate cure or identical results for everyone.