The Cutting-Edge Sleep Science You Need in Your Life Right Now

Dr Nicola Barclay, Sleep Scientist, Sleep Universal

Sleep is essential for our health and wellbeing. Yet, many people still struggle to get enough sleep, either due to lifestyle habits or underlying sleep disorders. Thankfully, sleep researchers continue to explore new ways to improve sleep quality and quantity. In this blog, we will discuss the newest sleep research that can influence people’s lives.

The importance of sleep for memory

A recent study conducted by scientists at the University of California, Berkeley, found that sleep plays a crucial role in memory consolidation. The study showed that during the deep sleep stage, the brain reactivates and replays the same neural patterns that were present during the learning phase. This process strengthens the connections between neurons, leading to better memory recall.

This research highlights the importance of getting enough deep sleep to improve memory retention. It also suggests that studying or learning before sleep may be more effective than during the middle of the day.

The impact of light exposure on sleep

The latest research suggests that exposure to artificial light, particularly blue light emitted by electronic devices, can disrupt our natural sleep–wake cycle. Blue light exposure suppresses the production of melatonin – a hormone that regulates sleep. This can lead to difficulty falling asleep and poor sleep quality.

To mitigate the impact of blue light on sleep, experts recommend avoiding the use of electronic devices before bedtime, using blue light-blocking glasses, or adjusting device settings to reduce blue light emission.

According to a study by Northwestern Medicine, exposure to any amount of light while sleeping at night can lead to obesity, high blood pressure and diabetes in older adults aged 63 to 84 years. The study found that those who were exposed to any amount of light while sleeping at night were significantly more likely to be obese and have high blood pressure and diabetes compared to adults who were not exposed to any light during the night.

So, it seems that turning off the lights at night and avoiding ambient light exposure is highly advisable – particularly in one’s later years. A simple solution here is to opt for an eye-mask.

Benefits of wearing an eye mask

In relation to light, a recent study showed that wearing an eye-mask overnight to block out ambient bright light that creeps through the curtains in the morning was associate with improved alertness the following morning, and better memory processes. In addition, participants were hooked up to devices that measure sleep patterns and the authors were able to demonstrate that on nights participants used an eye mask, sleep was richer in Slow Wave Activity – brain waves that are partially responsible for enhancing learning and memory.

Therefore, why not grab yourself an eye mask to optimise your memory and alertness.

The connection between sleep and mental health

A growing body of research links poor sleep quality to mental health issues such as depression, anxiety, and bipolar disorder. Sleep deprivation can also exacerbate existing mental health conditions.

Experts recommend addressing sleep problems as part of a comprehensive mental health treatment plan. Behavioural therapies such as cognitive-behavioural therapy for insomnia (CBT-I) have proven effective in treating both sleep disorders and mental health issues.

The benefits of napping

Napping has been shown to improve cognitive function, memory retention, and mood. A recent study found that even a short nap of 30 minutes or less can improve mood, mental alertness and memory performance.

Experts suggest that taking a 30-minute nap during the day can be an effective way to combat daytime sleepiness and improve productivity. However, it’s important to avoid napping too close to bedtime, as this can disrupt night-time sleep.

Benefits and harms of sleep tracking

There have been several recent studies on the pros and cons of sleep tracking. Some studies have suggested that sleep tracking can help individuals improve their sleep habits by providing feedback on sleep quality and identifying patterns of sleep disturbances.

Other studies have found that sleep tracking can lead to increased stress and anxiety, particularly if the data is inaccurate or leads to unrealistic expectations for sleep. Additionally, some researchers have raised concerns about the privacy implications of sleep tracking, as personal data is often collected and shared with third-party companies.

Overall, while sleep tracking may have potential benefits for some individuals, more research is needed to fully understand its effectiveness and potential problems, and to develop guidelines for its safe and responsible use.

Adhering to sleep duration guidelines

Recent research suggests that adhering to the recommended sleep duration of 7-9 hours per night can increase life expectancy. The study used data from a representative sample of Canadians and assessed the relative prevalence of shorter, recommended, and longer than recommended sleep durations, as well as the relative risks of all-cause mortality within these categories.

The study found that adhering to the recommended sleep duration can lead to additional years of life expectancy. However, it’s important to note that the risks associated with inadequate or excessive sleep duration may not stay constant throughout a person’s adult life. Lifestyle factors, such as work stress, can contribute to both morbidity and mortality, particularly among younger working adults. The study suggests that future research could use consumer sleep-tracking devices to gather more personalised data on how adhering to recommended sleep duration could affect specific health outcomes.

Effect of caffeine on sleep

The latest research confirms what we already suspected about caffeine and sleep. In a recent meta-analysis of over 29 studies, researchers found that caffeine consumption reduces total sleep time, increases sleep onset latency, and reduces sleep quality. The effect was greater in people who consumed caffeine in the afternoon or evening, in higher doses, and in non-habitual caffeine users.

The authors conclude that caffeine consumption should be avoided in the late afternoon and evening to improve sleep quality. In particular the authors suggest that coffee (with around 100mg caffeine per 250ml) should not be consumed in the 8 hours before bedtime. So reduce your caffeine intake after lunch!

Sleep and the glymphatic system

A recent paper reviews the impact of sleep components, quality, and patterns on the functioning of the glymphatic system in healthy adults. The glymphatic system is a waste clearance pathway in the brain that helps remove toxic waste products, including amyloid-beta and tau proteins, which are associated with Alzheimer’s disease.

It is a network of vessels that runs alongside the brain’s blood vessels, and it uses cerebrospinal fluid to flush out waste products from the brain. The glymphatic system is most active during sleep, particularly during deep sleep, and it may play an important role in maintaining brain health and preventing neurodegenerative diseases.

The review found that sleep quality, duration, and architecture are all important factors in glymphatic system function. Good quality sleep with sufficient duration and regular sleep patterns is associated with better glymphatic system function. Conversely, poor quality sleep, sleep deprivation, and irregular sleep patterns are associated with impaired glymphatic system function. The authors conclude that optimizing sleep habits may be an important factor in promoting brain health and reducing the risk of neurodegenerative diseases.

Getting the correct diagnosis

Sleep is complex, and the number of sleep disorders that are internationally recognised by the sleep practitioner’s go-to text (the International Classification of Sleep Disorders), exceeds 50. Getting a thorough sleep evaluation is key to implementing the most appropriate treatment and getting sleep back on track.

As an example, a recent article presents a case study of a 28-year-old man with Moebius syndrome who was initially diagnosed with hypersomnia but was later found to have irregular sleep-wake rhythm disorder. The patient had difficulty falling asleep and staying asleep at night, and was often tired during the day.

He was initially diagnosed with hypersomnia and was prescribed modafinil, which did not improve his symptoms. After further evaluation, the patient was diagnosed with irregular sleep-wake rhythm disorder, a circadian rhythm sleep disorder characterised by a disrupted sleep–wake cycle. Treatment with melatonin and light therapy improved his sleep quality and daytime alertness. The article highlights the importance of a comprehensive evaluation of sleep disorders in individuals and the potential for misdiagnosis when symptoms overlap with other sleep disorders.

A common sleep phenomenon you’ve probably experienced but never heard of

Have you ever been deep in sleep but become consciously aware within your dream, then realised that you can not move or speak, and you experience vivid (often horrific) hallucinations? You’re not alone! This is the phenomenon of Isolated Sleep Paralysis (ISP).

A recent article provides an overview of (ISP) based on a large international survey of over 6,000 participants. The survey found that ISP was reported by a significant proportion of participants and was associated with various risk factors such as poor sleep quality, longer sleep onset latency (the time it takes to get to sleep), insomnia, stress, anxiety, and depression.

Participants who experienced ISP reported a range of coping strategies, including relaxation techniques and changes to sleep habits such as sleeping regularly, trying to avoid being overtired, adjusting the sleep environment, moving position and making a noise, but there was no consensus on effective prevention or treatment methods.

Many people find sleep paralysis frightening (over 70% of participants stated significant fear during episodes), and there are many beliefs as to why this occurs (you can read more about this phenomenon here). The good news is that isolated sleep paralysis is benign, but this article highlights the need for further research into ISP and its potential impact on mental health and well-being.

Conclusion

In conclusion, sleep plays a critical role in our overall health and wellbeing. The latest sleep research highlights the importance of getting enough deep sleep for memory consolidation, mood and alertness, while also minimising exposure to light in the evening hours in order to improve sleep quality, and overall general health. Taking short naps should be considered in order to improve cognitive function and productivity. Sleep problems should also be addressed as part of a comprehensive mental health treatment plan. By implementing these insights into our daily routines, we can improve our sleep habits and enjoy the many benefits of a good night’s rest.

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