Summary: Simple lifestyle alterations can help reset the circadian clock, leading to improved mental and physical health for those who have trouble getting to sleep at night.
Source: University of Birmingham
A simple tweak to the sleeping patterns of ‘night owls’ – people with extreme late sleeping and waking habits – could lead to significant improvements in sleep/wake timings, improved performance in the mornings, better eating habits and a decrease in depression and stress.
New international research by the Universities of Birmingham and Surrey in the UK, and Monash University in Australia showed that, over a three-week period, it was possible to shift the circadian rhythm of ‘night owls’ using non-pharmacological and practical interventions.
The study, published in Sleep Medicine today, showed participants were able to bring forward their sleep/wake timings by two hours while having no negative effect on sleep duration. In addition, participants reported a decrease in feelings of depression and stress, as well as in daytime sleepiness.
“Our research findings highlight the ability of a simple non-pharmacological intervention to phase advance ‘night owls’, reduce negative elements of mental health and sleepiness, as well as manipulate peak performance times in the real world,” lead researcher Dr Elise Facer-Childs from Monash University’s Turner Institute for Brain and Mental Health said.
‘Night owls’ are individuals whose internal body clock dictates later-than-usual sleep and wake times – in this study participants had an average bedtime of 2.30am and wake-up time of 10.15am.
Disturbances to the sleep/wake system have been linked to a variety of health issues, including mood swings, increased morbidity and mortality rates, and declines in cognitive and physical performance.
“Having a late sleep pattern puts you at odds with the standard societal days, which can lead to a range of adverse outcomes – from daytime sleepiness to poorer mental wellbeing,” study co-author Dr Andrew Bagshaw from the University of Birmingham said.
“We wanted to see if there were simple things people could do at home to solve this issue. This was successful, on average allowing people to get to sleep and wake up around two hours earlier than they were before. Most interestingly, this was also associated with improvements in mental wellbeing and perceived sleepiness, meaning that it was a very positive outcome for the participants. We now need to understand how habitual sleep patterns are related to the brain, how this links with mental wellbeing and whether the interventions lead to long-term changes.”
Twenty-two healthy individuals participated in the study. For a period of three weeks participants in the experimental group were asked to:
Wake up 2-3 hours before regular wake up time and maximise outdoor light during the mornings.
Go to bed 2-3 hours before habitual bedtime and limit light exposure in the evening.
Keep sleep/wake times fixed on both work days and free days.
Have breakfast as soon as possible after waking up, eat lunch at the same time each day, and refrain from eating dinner after 7pm.
The results highlighted an increase in cognitive (reaction time) and physical (grip strength) performance during the morning when tiredness is often very high in ‘night owls’, as well as a shift in peak performance times from evening to afternoon. It also increased the number of days in which breakfast was consumed and led to better mental well-being, with participants reporting a decrease in feelings of stress and depression.
“Establishing simple routines could help ‘night owls’ adjust their body clocks and improve their overall physical and mental health. Insufficient levels of sleep and circadian misalignment can disrupt many bodily processes putting us at increased risk of cardiovascular disease, cancer and diabetes,” Professor Debra Skene from the University of Surrey said.
Dr Facer-Childs said ‘night owls’, compared to ‘morning larks’, tended to be more compromised in our society due to having to fit work/school schedules that are out of sync with their preferred patterns.
“By acknowledging these differences and providing tools to improve outcomes we can go a long way in a society that is under constant pressure to achieve optimal productivity and performance,” she said.
This intervention could also be applied within more niche settings, such as industry or within sporting sectors, which have a key focus on developing strategies to maximise productivity and optimise performance at certain times and in different conditions.
About this neuroscience research article
Source: University of Birmingham Media Contacts: Beck Lockwood – University of Birmingham Image Source: The image is in the public domain.
Resetting the late timing of ‘night owls’ has a positive impact on mental health and performance
There is conflict between living according to our endogenous biological rhythms and our external environment, with disruptions resulting in negative consequences to health and performance. This is often documented in shift work and jet lag, but ‘societal norms’ e.g. typical working hours, can create profound issues for ‘night owls’, people whose internal biological timing predisposes them to follow an unusually late sleep-wake cycle. Night owls have also been associated with health issues, mood disturbances, poorer performance and increased mortality rates. This study used a randomized control trial design aimed to shift the late timing of night owls to an earlier time (phase advance), using non-pharmacological, practical interventions in a real-world setting. These interventions targeted light exposure (through earlier wake up/sleep times), fixed meals times, caffeine intake and exercise. Overall, participants demonstrated a significant advance of ∼2 h in sleep/wake timings as measured by actigraphy and circadian phase markers (dim light melatonin onset and peak time of the cortisol awakening response), whilst having no adverse effect on sleep duration. Importantly, the phase advance was accompanied by significant improvements to self-reported depression and stress, as well as improved cognitive (reaction time) and physical (grip strength) performance measures during the typical ‘suboptimal’ morning hours. Our findings propose a novel strategy for shifting clock timing towards a pattern that is more aligned to societal demands that could significantly improve elements of performance, mental health and sleep timing in the real world.