What should you know about blood pressure high at night?

Blood pressure normally changes across the day. A reading taken after activity, worry, caffeine, nicotine, pain, or a disturbed night may not show your usual pattern. Repeatedly high readings while you are resting can be associated with hypertension and may prompt a clinician to review kidney health, weight, sleep quality, or medicines. Obstructive Sleep Apnoea can interrupt breathing during sleep and is one possible contributor. A single home reading cannot identify the cause.

Use a validated upper-arm monitor if available. Rest quietly before measuring, keep your back supported and feet on the floor, and place the cuff on bare skin at heart level. Record the time, reading, symptoms, sleep quality, and medicines taken. Do not change or skip prescribed treatment because of one result. Arrange a review if the pattern continues; your clinician may suggest home monitoring over several days or an ambulatory monitor that records readings during sleep.

Seek emergency help for high blood pressure with chest pain, severe breathlessness, sudden weakness or numbness, trouble speaking, confusion, fainting, or a sudden severe headache. These symptoms can signal problems such as Stroke, Transient Ischaemic Attack, Angina, or Heart Failure and should not be judged by the number alone. If readings remain repeatedly high without warning symptoms, contact a healthcare professional soon for assessment.

Could my medicines, sleep pattern, snoring, kidney health, or weight affect nighttime readings? Would ambulatory monitoring help? What should I do if a reading is high but I feel well?