Why does my blood pressure spike at night?
Last updated September 3, 2026.
Nighttime blood pressure should dip 10 to 20%; spiking instead usually traces to sleep apnea, salt, late-day stimulants, stress, or kidney issues, and it predicts cardiovascular risk better than daytime readings. Obstructive sleep apnea is the leading driver: every breathing pause fires a pressure surge, all night long. High salt intake shows up at night too, since fluid redistributes when you lie flat. Evening alcohol, late decongestants or stimulants, stress, shift work, and kidney disease are the other usual suspects. Patterns have names: a normal dipper falls 10 to 20% overnight, a nondipper barely falls, and a riser actually climbs, with risers carrying the highest risk. The only way to know your pattern is measurement: 24-hour ambulatory monitoring or consistent bedtime and morning home readings. Mention snoring, witnessed pauses in breathing, and unrefreshing sleep explicitly to your clinician, because nocturnal hypertension is often a sleep apnea diagnosis waiting to be made. Treatment can include a sleep study, salt restriction, and retiming medication so it covers the night.
What to do
- Measure the night: ask about 24-hour ambulatory monitoring, or log bedtime and morning readings.
- Screen for apnea: snoring, witnessed pauses, and unrefreshing sleep are the flags to report.
- Cut evening salt and alcohol: both push nighttime pressure up.
- Review late-day meds: decongestants and stimulants taken late can spike readings.
- Ask about timing: some regimens work better dosed for overnight coverage.
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