Hypertension is a condition people tend to become more aware of past midlife. By the time you reach your 50s or 60s, high blood pressure can start to feel like a looming health threat. Most people associate high blood pressure with stress, or intake of salt, but not so many realise that several lifestyle factors play a role in developing hypertension or increasing your risk of having uncontrolled high blood pressure.
This is important because hypertension doesn’t come out of nowhere. In many cases, it develops gradually, with the body giving small warning signs long before a professional diagnosis is made. Poor sleep, a high sugar diet, chronic stress, weight gain, inflammation, and hormones can all play a role.
The role of sleep in developing high blood pressure is rather misunderstood and underestimated. Getting good quality sleep isn’t just about feeling less tired in the morning; it allows the brain and body to slow down and recover, improving physical and mental health. When sleep is inadequate or of poor quality, blood pressure is one area where strain can begin to show.
Stress is not the only risk factor in hypertension
Stress plays a role in high blood pressure, but it’s not the only significant factor. Our body is constantly seeking to be in the state of homeostasis - a balance. Stress and events that cause stress (stressors) are potentially everywhere in our modern hectic life, and hence it is easy to fall into the flawed thinking that unless you feel stressed, it does not have an effect on your health. Not allowing recovery from stress, the nervous system is constantly in overdrive.
The role of sleep in developing hypertension is often undervalued, but it’s one of the most significant factors that differentiates good health and ill health. For instance, studies show that cortisol levels increase by 21% with sleep loss, having regularly elevated cortisol levels leads to increased hunger, insulin resistance and excess weight - all of which are risk factors for high blood pressure.
One bad night’s sleep might not seem that significant to us, but short sleep duration for the physiological body (typically defined as less than 6 or 7 hours) is significantly associated with high blood pressure, and presents an increased risk for coronary heart disease and mortality. Sleep disorders like insomnia are associated with a 45% increased risk of developing or dying from cardiovascular disease.
Why is sleep so significant and what are the mechanisms?
Sleep is one of the body’s main opportunities to recover. When sleep is shortened or consistently disrupted, this recovery process is reduced, and the body can begin to show signs of strain much sooner than many people realise.
Shortened sleep of 6 hours or less can raise cortisol levels further, keeping the body in a heightened inflammatory state. This kind of low-level cellular inflammation can damage blood vessels over time, creating furred up arteries and veins, which means the heart has to work harder to pump blood around the body and blood pressure can begin to rise.
The prevailing assumption is that sleep can only become a health issue after months or years of sleep deprivation. Yet the body can respond much faster than that. Even one night of shorter sleep causes an increase in systolic blood pressure. In other words, it does not take long for the cardiovascular system to feel the effects.
This does not mean that a week of bad sleep will result in hypertension. But it does show how quickly the body reacts when recovery time is cut short.
Why shorter sleep affects the blood vessels
There are several reasons why poor sleep can contribute to rising blood pressure over time.
The first is inflammation. Sleep is when the body recovers and repairs itself. If sleep is shortened or broken, it can alter inflammatory responses, and studies have shown a significant increase in proinflammatory markers following acute sleep deprivation. Over time, when the body doesn’t clear inflammation during sleep, it can contribute to damage within the cardiovascular system and elevate your risk of cardiovascular issues.
The second is cortisol. A healthy, 24-hour sleep-wake cycle depends on a proper rhythm between melatonin and cortisol. In the evening, melatonin should rise and peak around 9:30 - 10 pm, while cortisol falls to its lowest level of the day. During the night, melatonin continues to be produced, and around 5 - 5:30 am, the ratio flips back, helping the body wake naturally. Cortisol then continues to rise, peaking around 9 am. However, when sleep is restricted or irregular, this rhythm becomes less stable and predictable. This can leave the body in more of a stressed state than a recovery state.
The metabolic side of hypertension is often missed
The development of hypertension is commonly associated with a high salt intake. But salt isn’t a root cause, sugar is. Having a high-sugar diet, especially one with lots of sugary drinks (fizzy and soft drinks), processed foods and energy snacks, causes unregulated blood sugar levels that can gradually push the body towards insulin resistance, weight gain, and later high blood pressure.
This becomes even more relevant when you experience sleep disturbances. Lack of sleep changes your appetite, increases cravings for quick energy, and makes you far more likely to reach for sugar and caffeine just to get through the day. This can become a difficult cycle to break. Poor quality sleep raises physiological stress. Higher stress affects hormones and appetite; feeling tired and in low mood increases cravings for highly-palatable foods - those that are rich in sugar and fat, this vicious cycle becomes difficult for many to break.
Quality matters as much as quantity
When looking at the connection between sleep and hypertension, it’s important to look beyond the number of hours you spend in bed. Sleep quality matters just as much as quantity.
You can spend the recommended 7 to 9 hours in bed, but still wake up feeling exhausted because your sleep is broken, too light, or out of rhythm. Irregular sleep patterns and poor-quality sleep have been linked with wider long-term health risks, including cognitive decline, and potentially cause neurodegenerative diseases, such as dementia and Alzheimer’s.
This is why working with sleep problems is not a simple box-ticking exercise. When working with people to restore their sleep, we want to know whether they struggle to fall asleep, wake often in the night, go to bed at inconsistent times, or feel wired and tired. Disturbed sleep tends to fall into three main categories: environmental, physiological and psychological, and understanding that is often where the real progress begins.
Why sleep still needs to be the foundation
If you’re worried about hypertension, sleep is one of the most important areas to look at. When there is lack of sleep or sleep is disturbed, the body stays under pressure, constantly in stress response. Cortisol remains high, inflammation is harder to regulate, cravings for sugar and caffeine become more difficult to manage, and blood pressure has less chance to settle into a healthier rhythm. When sleep improves, the body is in a much better position to regulate itself properly.
That doesn’t mean sleep is the only factor behind hypertension, but it’s often one of the most overlooked. Yet, because it affects so many systems at once, it can be one of the most impactful places to start improving your overall health and wellbeing.
If poor sleep has become part of your normal, the Restore Sleep Programme might be a good place to start. It’s designed to review your current sleep patterns and bedtime routine, address the root cause of your insomnia, assess your medical history, stress levels, and dietary habits, and help you take back control of your sleep, even during demanding periods.
To talk through your symptoms and explore the right next step, get in touch today.
Stay healthy, be joyful!
Love, Katya