Some mornings, you wake up and the dream is right there. Clear and vivid. You might still feel the emotion in your chest, and it can take a few minutes to remember where you are and what was real.

Other mornings, you open your eyes and there is nothing. Just a quiet sense of having slept.

You might know people who think they do not dream. However, the reality is we all do. Sometimes we have many in one night.

What varies is whether people remember their dreams and how often they remember them.

Dream recall myth vs reality

During the night, we cycle through periods of light sleep, deep sleep and rapid-eye-movement (REM) sleep. A full cycle takes about 90 minutes.

People generally spend more time in deep sleep in the first half of the night and more time in REM sleep in the second half.

The main function of deep sleep is restorative: to replenish energy, repair our bodies and help store memories.

REM sleep is important for memory consolidation and emotional processing. Later in the night, REM sleep becomes longer. This is the stage most closely linked to vivid, emotional dreaming.

If you wake up during or just after REM sleep, you are much more likely to remember a dream. If you wake from deep sleep, you probably will not, even though you were dreaming earlier. It isn’t a sign something is wrong; it’s simply how the sleeping brain works.

Another myth is dreams only happen in REM sleep. While REM dreams tend to be more intense and story-like, dreaming can happen in other stages, too; they are just often quieter and harder to recall.

So if you wake up some mornings with a clear recollection of your dream, and other mornings with nothing at all, that is completely normal. It doesn’t mean you didn’t dream. It just means you woke up at a different point in your sleep cycle.

Why do some people remember their dreams more often?

Several factors affect whether you recall dreams.

As you get older, your capacity to recall dreams decreases. Some studies suggest women are more likely to remember dreams than men. Some medications, such as antidepressants and sedatives, can affect your dream recall.

Timing plays a big role. We spend more time in REM sleep later in the night, so dreams that happen closer to morning are easier to remember. Waking up briefly during the night offers a chance to remember dreams before they fade. That’s why parents of young children and light sleepers, who are more likely to wake up from REM sleep, often report remembering more dreams.

How you wake up also matters. If someone jolts you awake, the dream can vanish in an instant. But if you are woken gently, someone softly calling your name, there is a better chance the dream lingers long enough for you to remember.

Some people are naturally “high recallers” and are just better at capturing their dreams before they fade. And therefore, they consistently remember dreams.

Why do some dreams feel intense?

Dreams can sometimes feel highly emotional, dramatic or unusually vivid. This is largely because REM sleep, the stage most associated with dreaming, involves increased activation of regions of the brain that control our emotions, such as the amygdala and limbic system.

This occurs alongside relatively reduced activity in parts of the prefrontal cortex that regulate logic and emotional control.

Stress, life changes or heightened emotions can make dreams feel more intense. Dreams often reflect elements of real-life experiences as the brain tries to process events from the day and consolidate them into long-term memory.

In most cases, having intense dreams is entirely normal and part of healthy emotional processing.

So is dreaming a reflection of good sleep?

Remembering your dreams does not automatically mean you had poor sleep, and forgetting them does not mean your sleep was perfect.

Rather than using dream recall as an indicator of sleep quality, it is more helpful to focus on how you feel during the day. Indicators such as feeling rested on waking and daytime energy provide a more meaningful indicator of your sleep health.

For most people, differences in dream recall and dream intensity are normal and shouldn’t cause concern. Dream frequency varies widely among people and across lifespans.

However, it may be helpful to seek advice from a health professional if:

• you experience persistent daytime exhaustion despite adequate time in bed
• nightmares are frequent, highly distressing or interfere with your mood and functioning
• sleep is regularly disrupted by awakenings, panic or prolonged difficulty returning to sleep.

If you feel rested, functional and emotionally stable during the day, occasional vivid dreams or changes in recall are completely fine and simply part of how healthy sleep unfolds.

Yaqoot Fatima, Professor of Sleep Health, University of the Sunshine Coast; Danielle Wilson, Research Fellow and Sleep Scientist at the Thompson Institute, University of the Sunshine Coast, and Nisreen Aouira, Research Program Manager, Let’s Yarn About Sleep, Thompson Institute, University of the Sunshine Coast

This article is republished from The Conversation under a Creative Commons license. Read the original article.

One in three Australian adults has high blood pressure (hypertension). Excess salt (sodium) increases the risk of high blood pressure so everyone with hypertension is advised to reduce salt in their diet.

But despite decades of strong recommendations we have failed to get Australians to cut their intake. It’s hard for people to change the way they cook, season their food differently, pick low-salt foods off the supermarket shelves and accept a less salty taste.

Now there is a simple and effective solution: potassium-enriched salt. It can be used just like regular salt and most people don’t notice any important difference in taste.

Switching to potassium-enriched salt is feasible in a way that cutting salt intake is not. Our new research concludes clinical guidelines for hypertension should give patients clear recommendations to switch.

What is potassium-enriched salt?

Potassium-enriched salts replace some of the sodium chloride that makes up regular salt with potassium chloride. They’re also called low-sodium salt, potassium salt, heart salt, mineral salt, or sodium-reduced salt.

Potassium chloride looks the same as sodium chloride and tastes very similar.

Potassium-enriched salt works to lower blood pressure not only because it reduces sodium intake but also because it increases potassium intake. Insufficient potassium, which mostly comes from fruit and vegetables, is another big cause of high blood pressure.

What is the evidence?

We have strong evidence from a randomised trial of 20,995 people that switching to potassium-enriched salt lowers blood pressure and reduces the risks of stroke, heart attacks and early death. The participants had a history of stroke or were 60 years of age or older and had high blood pressure.

An overview of 21 other studies suggests much of the world’s population could benefit from potassium-enriched salt.

The World Health Organisation’s 2023 global report on hypertension highlighted potassium-enriched salt as an “affordable strategy” to reduce blood pressure and prevent cardiovascular events such as strokes.

What should clinical guidelines say?

We teamed up with researchers from the United States, Australia, Japan, South Africa and India to review 32 clinical guidelines for managing high blood pressure across the world. Our findings are published today in the American Heart Association’s journal, Hypertension.

We found current guidelines don’t give clear and consistent advice on using potassium-enriched salt.

While many guidelines recommend increasing dietary potassium intake, and all refer to reducing sodium intake, only two guidelines – the Chinese and European – recommend using potassium-enriched salt.

To help guidelines reflect the latest evidence, we suggested specific wording which could be adopted in Australia and around the world:

Why do so few people use it?

Most people are unaware of how much salt they eat or the health issues it can cause. Few people know a simple switch to potassium-enriched salt can help lower blood pressure and reduce the risk of a stroke and heart disease.

Limited availability is another challenge. Several Australian retailers stock potassium-enriched salt but there is usually only one brand available, and it is often on the bottom shelf or in a special food aisle.

Potassium-enriched salts also cost more than regular salt, though it’s still low cost compared to most other foods, and not as expensive as many fancy salts now available.

A 2021 review found potassium-enriched salts were marketed in only 47 countries and those were mostly high-income countries. Prices ranged from the same as regular salt to almost 15 times greater.

Even though generally more expensive, potassium-enriched salt has the potential to be highly cost effective for disease prevention.

Preventing harm

A frequently raised concern about using potassium-enriched salt is the risk of high blood potassium levels (hyperkalemia) in the approximately 2% of the population with serious kidney disease.

People with serious kidney disease are already advised to avoid regular salt and to avoid foods high in potassium.

No harm from potassium-enriched salt has been recorded in any trial done to date, but all studies were done in a clinical setting with specific guidance for people with kidney disease.

Our current priority is to get people being managed for hypertension to use potassium-enriched salt because health-care providers can advise against its use in people at risk of hyperkalemia.

In some countries, potassium-enriched salt is recommended to the entire community because the potential benefits are so large. A modelling study showed almost half a million strokes and heart attacks would be averted every year in China if the population switched to potassium-enriched salt.

What will happen next?

In 2022, the health minister launched the National Hypertension Taskforce, which aims to improve blood pressure control rates from 32% to 70% by 2030 in Australia.

Potassium-enriched salt can play a key role in achieving this. We are working with the taskforce to update Australian hypertension management guidelines, and to promote the new guidelines to health professionals.

In parallel, we need potassium-enriched salt to be more accessible. We are engaging stakeholders to increase the availability of these products nationwide.

The world has already changed its salt supply once: from regular salt to iodised salt. Iodisation efforts began in the 1920s and took the best part of 100 years to achieve traction. Salt iodisation is a key public health achievement of the last century preventing goitre (a condition where your thyroid gland grows larger) and enhancing educational outcomes for millions of the poorest children in the world, as iodine is essential for normal growth and brain development.

The next switch to iodised and potassium-enriched salt offers at least the same potential for global health gains. But we need to make it happen in a fraction of the time.

Xiaoyue Xu (Luna), Scientia Lecturer, UNSW Sydney; Alta Schutte, SHARP Professor of Cardiovascular Medicine, UNSW Sydney, and Bruce Neal, Executive Director, George Institute Australia, George Institute for Global Health

This article is republished from The Conversation under a Creative Commons license. Read the original article.