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How do CBD and THC affect sleep?

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CBD is known to help aid sleep, but what about THC?

A good night’s sleep leaves us feeling rested and refreshed, ready to face the day ahead. But, for too many people, that’s nothing more than a pipe dream.

Insomnia is increasingly common, and, while it is often assumed to be a short-term response to stress or external factors, around 30 per cent of sufferers display chronic symptoms.

Chronic insomnia is characterised by sleep disturbances, such as difficulty falling asleep, maintaining sleep, or inability to return to sleep on waking, happening at least three nights per week and for at least three months. Such disturbances are often coupled with significant daytime impairments in social life, function levels and educational achievement; indeed, it is often the effects of the sleeplessness on daily life that prompt a sufferer to seek treatment.  

While there are steps we can all take to improve our sleep, such as regular exercise, reducing stress and good sleep hygiene, sometimes sufferers turn to over-the-counter medications to help them drift off. However, these have a number of significant side effects, and are not seen as a sustainable solution.

Meanwhile, a growing body of research has found that CBD can have a positive effect on sleep, both by aiding relaxation and also by stimulating CBD receptors in the part of the brain responsible for maintaining sleep cycles.

However, most of the previous studies have focused on CBD as a standalone compound – until now…

A recent ongoing study reported in the British Medical Journal is investigating the effects of both CBD and THC (the psychoactive element of cannabis) on sleep and the resulting function levels the following morning. 

The research aims to test the safety and efficacy of an oral oil solution containing 10mg of THC and 200mg CBD, and will use 20 participants diagnosed with chronic insomnia disorder. 

The participants, who are all aged between 35 and 60, were recruited over an 18-month period and

each received both the active drug and matched placebo during two overnight study assessment visits. 

The researchers’ primary aim is to assess total sleep time and wake after sleep onset assessed via polysomnography. 

In addition, they will use MRI technology to examine the brain activation of the participants during sleep and wake periods, comparing the effects of CBD/THC versus the placebo. 

Next-day cognitive function, alertness and simulated driving performance will also be investigated.

The study authors said: “Insomnia is a highly prevalent and costly condition that is associated with increased health risks and healthcare utilisation. 

“Anecdotally, cannabis use is frequently reported by consumers to promote sleep. However, there is limited research on the effects of cannabis on sleep and daytime function in people with insomnia disorder using objective measures. 

“This proof-of-concept study will evaluate the effects of a single dose of an oral cannabis-based medicine on sleep and daytime function in participants with chronic insomnia disorder.”

As we have seen, previous studies have appeared to show a positive effect of CBD on sleep, and, while further research such as the above is needed, there is certainly an appetite amongst consumers for a natural, effective sleep aid.

Sarah Sinclair is an award-winning freelance journalist covering health, drug policy and social affairs. She is one of the few UK reporters specialising in medical cannabis policy and as the former editor of Cannabis Health has covered developments in the European cannabis sector extensively, with a focus on patients and consumers. She continues to report on cannabis-related health and policy for Forbes, Cannabis Health and Business of Cannabis and has written for The i Paper, Byline Times, The Lead, Positive News, Leafie & others. Sarah has an NCTJ accreditation and an MA in Journalism from the University of Sunderland and has completed additional specialist training through the Medical Cannabis Clinicians Society in the UK. She has spoken at leading industry events such as Cannabis Europa.

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