A bad night of sleep can leave you groggy the next morning. But over time, bad sleep can also put extra strain on your heart.
“Sleep is a critical time for the cardiovascular system to reset,” says Jeffrey Berman, MD, a cardiologist with Hartford HealthCare’s Heart & Vascular Institute. “When sleep is disrupted or insufficient, that recovery process doesn’t happen the way it should.”
Here’s how your sleep habits could be affecting your blood pressure and what you can do about it.
1. Your blood pressure is supposed to drop at night
During healthy sleep, your blood pressure naturally dips. This gives your heart and blood vessels a chance to rest and recover.
“Normally, we see a drop in blood pressure during sleep, often referred to as ‘nocturnal dipping,’” Dr. Berman says. “This is an important part of maintaining cardiovascular health.”
But that pattern doesn’t always happen.
“When sleep is poor or interrupted, that drop may be reduced or absent,” he adds. “Over time, that can contribute to higher overall blood pressure and increased cardiovascular risk.”
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2. Poor sleep keeps your body in “stress mode”
When you don’t sleep well, your body doesn’t fully relax. Instead, it stays in a more activated state.
“Sleep deprivation can increase activity in the sympathetic nervous system, which is responsible for the ‘fight or flight’ response,” Dr. Berman says. “That can lead to elevated heart rate and blood pressure, even during times when your body should be at rest.”
And it’s not just a one-time issue.
“Chronically poor sleep can keep the body in this heightened state for longer periods,” he notes. “That ongoing stress response can have a significant impact on your blood pressure over time.”
> Related: What Happens to Your Body After Just One Week of Better Sleep
3. Sleep apnea can raise blood pressure
Sometimes the issue isn’t just how long you sleep, it’s how well you breathe while you’re sleeping.
“Obstructive sleep apnea is strongly linked to high blood pressure,” Dr. Berman notes. “Each pause in breathing can cause a temporary spike in blood pressure and place additional strain on the heart.”
And many people don’t realize they have it.
“Symptoms like loud snoring, gasping during sleep or excessive daytime fatigue can be signs of sleep apnea,” he says. “Identifying and treating it can make a meaningful difference in blood pressure control.”
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4. Poor sleep can lead to long-term challenges
Cutting back on sleep might feel manageable in the moment. But over time, it can have lasting effects.
“Consistently getting less than six hours of sleep per night has been associated with a higher risk of developing hypertension,” Dr. Berman cautions. “It affects hormonal balance, metabolism and how the body regulates blood pressure.”
Those changes can add up over time.
“Sleep impacts multiple systems that influence cardiovascular health,” he adds. “When it’s lacking, the effects aren’t just immediate, they can become long term.”
> Related: What Your Blood Pressure Says About Your Health
5. Sleep affects your daily habits, too
There’s another layer to consider. When you’re tired, your habits tend to shift, and that can indirectly affect your blood pressure.
“Poor sleep can influence choices around diet, physical activity and stress management,” Dr. Berman says. “You may be more likely to reach for high sodium foods, skip exercise or feel more stressed overall.”
Those patterns matter.
“All of these behaviors play a role in blood pressure control,” he notes. “Sleep is often the starting point that influences everything else.”
> Related: These 6 Sleep Hygiene Tips Can Improve Your Blood Pressure and Overall Health
Improving sleep can support better blood pressure
The good news? Sleep is something you can work on, and even small improvements can make a difference.
“Prioritizing consistent sleep habits can help support healthier blood pressure levels,” Dr. Berman says. “That includes going to bed at the same time, creating a comfortable sleep environment and limiting things like caffeine and screen time before bedtime.”
It doesn’t have to be complicated.
“Addressing sleep is one of the most practical, effective strategies we have for supporting heart health,” he adds. “It’s a foundational piece that often gets overlooked.”
