It’s one of the most pervasive messages about technology and sleep. We’re told bright, blue light from screens prevents us falling asleep easily. We’re told to avoid scrolling on our phones before bedtime or while in bed. We’re sold glasses to help filter out blue light. We put our phones on “night mode” to minimise exposure to blue light.

But what does the science actually tell us about the impact of bright, blue light and sleep? When our group of sleep experts from Sweden, Australia and Israel compared scientific studies that directly tested this, we found the overall impact was close to meaningless. Sleep was disrupted, on average, by less than three minutes.

We showed the message that blue light from screens stops you from falling asleep is essentially a myth, albeit a very convincing one.

Instead, we found a more nuanced picture about technology and sleep.

What we did

We gathered evidence from 73 independent studies with a total of 113,370 participants of all ages examining various factors that connect technology use and sleep.

We did indeed find a link between technology use and sleep, but not necessarily what you’d think.

We found that sometimes technology use can lead to poor sleep and sometimes poor sleep can lead to more technology use. In other words, the relationship between technology and sleep is complex and can go both ways.

How is technology supposed to harm sleep?

Technology is proposed to harm our sleep in a number of ways. But here’s what we found when we looked at the evidence:

• bright screen light – across 11 experimental studies, people who used a bright screen emitting blue light before bedtime fell asleep an average of only 2.7 minutes later. In some studies, people slept better after using a bright screen. When we were invited to write about this evidence further, we showed there is still no meaningful impact of bright screen light on other sleep characteristics including the total amount or quality of sleep
• arousal is a measure of whether people become more alert depending on what they’re doing on their device. Across seven studies, people who engaged in more alerting or “exciting” content (for example, video games) lost an average of only about 3.5 minutes of sleep compared to those who engaged in something less exciting (for example, TV). This tells us the content of technology alone doesn’t affect sleep as much as we think
• we found sleep disruption at night (for example, being awoken by text messages) and sleep displacement (using technology past the time that we could be sleeping) can lead to sleep loss. So while technology use was linked to less sleep in these instances, this was unrelated to being exposed to bright, blue light from screens before bedtime.

Which factors encourage more technology use?

Research we reviewed suggests people tend to use more technology at bedtime for two main reasons:

• to “fill the time” when they’re not yet sleepy. This is common for teenagers, who have a biological shift in their sleep patterns that leads to later sleep times, independent of technology use.
• to calm down negative emotions and thoughts at bedtime, for apparent stress reduction and to provide comfort.

There are also a few things that might make people more vulnerable to using technology late into the night and losing sleep.

We found people who are risk-takers or who lose track of time easily may turn off devices later and sacrifice sleep. Fear of missing out and social pressures can also encourage young people in particular to stay up later on technology.

What helps us use technology sensibly?

Last of all, we looked at protective factors, ones that can help people use technology more sensibly before bed.

The two main things we found that helped were self-control, which helps resist the short-term rewards of clicking and scrolling, and having a parent or loved one to help set bedtimes.

Why do we blame blue light?

The blue light theory involves melatonin, a hormone that regulates sleep. During the day, we are exposed to bright, natural light that contains a high amount of blue light. This bright, blue light activates certain cells at the back of our eyes, which send signals to our brain that it’s time to be alert. But as light decreases at night, our brain starts to produce melatonin, making us feel sleepy.

It’s logical to think that artificial light from devices could interfere with the production of melatonin and so affect our sleep. But studies show it would require light levels of about 1,000-2,000 lux (a measure of the intensity of light) to have a significant impact.

Device screens emit only about 80-100 lux. At the other end of the scale, natural sunlight on a sunny day provides about 100,000 lux.

What’s the take-home message?

We know that bright light does affect sleep and alertness. However our research indicates the light from devices such as smartphones and laptops is nowhere near bright or blue enough to disrupt sleep.

There are many factors that can affect sleep, and bright, blue screen light likely isn’t one of them.

The take-home message is to understand your own sleep needs and how technology affects you. Maybe reading an e-book or scrolling on socials is fine for you, or maybe you’re too often putting the phone down way too late. Listen to your body and when you feel sleepy, turn off your device.

Chelsea Reynolds, Casual Academic/Clinical Educator and Clinical Psychologist, College of Education, Psychology and Social Work, Flinders University

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

Endometriosis is a condition that affects women and girls. It occurs when tissue similar to the lining of the uterus ends up in other areas of the body. These areas include the ovaries, bladder, bowel and digestive tract.

Endometriosis will affect nearly one million Australian women and girls in their lifetime. Many high-profile Australians are affected by endometriosis including Bindi Irwin, Sophie Monk and former Yellow Wiggle, Emma Watkins.

Symptoms of endometriosis include intense pelvic, abdominal or low back pain (that is often worse during menstruation), bladder and bowel problems, pain during sex and infertility.

But women and girls wait an average of seven years to receive a diagnosis. Many are living with the burden of endometriosis and not receiving treatments that could improve their quality of life. This includes physiotherapy.

How is endometriosis treated?

No treatments cure endometriosis. Symptoms can be reduced by taking medications such as non-steriodal anti-inflammatories (ibuprofen, aspirin or naproxen) and hormonal medicines.

Surgery is sometimes used to diagnose endometriosis, remove endometrial lesions, reduce pain and improve fertility. But these lesions can grow back.

Whether they take medication or have surgery, many women and girls continue to experience pain and other symptoms.

Pelvic health physiotherapy is often recommended as a non-drug management technique to manage endometriosis pain, in consultation with a gynaecologist or general practitioner.

The goal of physiotherapy treatment depends on the symptoms but is usually to reduce and manage pain, improve ability to do activities, and ultimately improve quality of life.

What could you expect from your first appointment?

Physiotherapy management can differ based on the severity and location of symptoms. Prior to physical tests and treatments, your physiotherapist will comprehensively explain what is going to happen and seek your permission.

They will ask questions to better understand your case and specific needs. These will include your age, weight, height as well as the presence, location and intensity of symptoms.

You will also be asked about the history of your period pain, your first period, the length of your menstrual cycle, urinary and bowel symptoms, sexual function and details of any previous treatments and tests.

They may also assess your posture and movement to see how your muscles have changed because of the related symptoms.

They will press on your lower back and pelvic muscles to spot painful areas (trigger points) and muscle tightness.

If you consent to a vaginal examination, the physiotherapist will use one to two gloved fingers to assess the area inside and around your vagina. They will also test your ability to coordinate, contract and relax your pelvic muscles.

What type of treatments could you receive?

Depending on your symptoms, your physiotherapist may use the following treatments:

General education

Your physiotherapist will give your details about the disease, pelvic floor anatomy, the types of treatment and how these can improve pain and other symptoms. They might teach you about the changes to the brain and nerves as a result of being in long-term pain.

They will provide guidance to improve your ability to perform daily activities, including getting quality sleep.

If you experience pain during sex or difficulty using tampons, they may teach you how to use vaginal dilators to improve flexibility of those muscles.

Pelvic muscle exercises

Pelvic muscles often contract too hard as a result of pain. Pelvic floor exercises will help you contract and relax muscles appropriately and provide an awareness of how hard muscles are contracting.

This can be combined with machines that monitor muscle activity or vaginal pressure to provide detailed information on how the muscles are working.

Yoga, stretching and low-impact exercises

Yoga, stretching and low impact aerobic exercise can improve fitness, flexibility, pain and blood circulation. These have general pain-relieving properties and can be a great way to contract and relax bigger muscles affected by long-term endometriosis.

These exercises can help you regain function and control with a gradual progression to perform daily activities with reduced pain.

Hydrotherapy (physiotherapy in warm water)

Performing exercises in water improves blood circulation and muscle relaxation due to the pressure and warmth of the water. Hydrotherapy allows you to perform aerobic exercise with low impact, which will reduce pain while exercising.

However, while hydrotherapy shows positive results clinically, scientific studies to show its effectiveness studies are ongoing.

Manual therapy

Women frequently have small areas of muscle that are tight and painful (trigger points) inside and outside the vagina. Pain can be temporarily reduced by pressing, massaging or putting heat on the muscles.

Physiotherapists can teach patients how to do these techniques by themselves at home.

What does the evidence say?

Overall, patients report positive experiences pelvic health physiotherapists treatments. In a study of 42 women, 80% of those who received manual therapy had “much improved pain”.

In studies investigating yoga, one study showed pain was reduced in 28 patients by an average of 30 points on a 100-point pain scale. Another study showed yoga was beneficial for pain in all 15 patients.

But while some studies show this treatment is effective, a review concluded more studies were needed and the use of physiotherapy was “underestimated and underpublicised”.

What else do you need to know?

If you have or suspect you have endometriosis, consult your gynaecologist or GP. They may be able to suggest a pelvic health physiotherapist to help you manage your symptoms and improve quality of life.

As endometriosis is a chronic condition you may be entitled to five subsidised or free sessions per calendar year in clinics that accept Medicare.

If you go to a private pelvic health physiotherapist, you won’t need a referral from a gynaecologist or GP. Physiotherapy rebates can be available to those with private health insurance.

The Australian Physiotherapy Association has a Find a Physio section where you can search for women’s and pelvic physiotherapists. Endometriosis Australia also provides assistance and advice to women with Endometriosis.

Thanks to UTS Masters students Phoebe Walker and Kasey Collins, who are researching physiotherapy treatments for endometriosis, for their contribution to this article.

Peter Stubbs, Senior Lecturer in Physiotherapy, University of Technology Sydney and Caroline Wanderley Souto Ferreira, Visiting Professor of Physiotherapy, University of Technology Sydney

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