Miya Pearson
Circadian rhythms are physical, mental, and behavioural changes that occur in the body at consistent times over a 24-hour period. Circadian rhythms are controlled by a master clock in the brain, which is located in the hypothalamus and is made up of 20,000 neurons. This master clock, also known as the suprachiasmatic nucleus (SCN), is responsible for regulating the sleep-wake cycle, which is why disruptions to this cycle can have a significant impact on overall health. The good news is that it is possible to reset the brain's sleep-wake clock through various methods, including manipulating light exposure, maintaining a consistent sleep schedule, and making lifestyle changes.
| Characteristics | Values |
|---|---|
| Master clock location | Suprachiasmatic nucleus (SCN) in the hypothalamus |
| Master clock composition | 20,000 neurons |
| Master clock function | Receives light information from the retina and sends it to the rest of the brain |
| Sleep-wake cycle | 24-hour cycle |
| Sleep-wake cycle function | Regulates when you feel sleepy and when you feel alert |
| Sleep-wake cycle influencers | Light exposure, exercise, eating habits, and other factors |
| Resetting the sleep-wake cycle | Manipulating light exposure, maintaining a consistent sleep schedule, avoiding screen time before bed, and adjusting eating habits |
| Resetting the sleep-wake cycle duration | Depends on the cause of disruption; can vary from one day per time zone to several weeks or months |
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What You'll Learn
Avoid exposure to light before sleep
Light plays a crucial role in regulating the body's internal clock, which is also known as the circadian rhythm. This 24-hour cycle is controlled by a small part of the brain called the circadian pacemaker, which is strongly influenced by light exposure. When light enters the eye, it is sensed by a group of cells in the retina, which then sends signals to the brain to control other systems in the body according to the time of day.
Evening light exposure can shift your body clock to a later schedule, as light sends signals to the brain that it is time to be awake. This is because light suppresses the production of melatonin, a hormone that is crucial for sleep. The body's levels of melatonin rise at sunset to induce sleep and then fall towards sunrise. However, when light hits the retina in the evening, it can slow or stop the production of melatonin, delaying the body's ability to transition into sleep.
Artificial light, such as blue-white light from electronic devices, can be particularly disruptive to sleep. This is because it can suppress the release of melatonin and disturb your natural body clock. To avoid this, it is recommended that you dim the lights or turn off screens and media devices at least one hour before bedtime.
However, it is important to get exposure to natural light during the day, as this can improve your mood, reduce stress, and enhance cognition and learning. Even a 20-minute walk in the morning sun can help to reduce depression and sleep disorders.
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Avoid screens and blue light before bed
The human body's master clock, or the body's internal clock, is the principal driver of circadian rhythms, including the 24-hour sleep-wake cycle. This circadian rhythm is crucial to managing the balance between sleep and wakefulness. Light exposure is an essential influence on circadian rhythm, which is closely aligned with the day-night cycle. When the eyes are exposed to light, the brain sends signals associated with wakefulness.
Blue light, in particular, has the largest impact on the body's internal clock. It stimulates parts of the brain that make us feel alert, elevating our body temperature and heart rate. During the day, blue light can improve performance and attention, tuning our circadian rhythms and setting us up for a better night's sleep after the sun sets. However, exposure to blue light in the hours leading up to bedtime can hinder sleep. Blue light suppresses the body's release of melatonin, a hormone that makes us feel drowsy. While this promotes wakefulness during the day, it becomes unhelpful at night when we are trying to sleep. Being exposed to blue light in the evening can trick our brain into thinking it is still daytime, disrupting circadian rhythms and leaving us feeling alert instead of tired.
Chronic misalignment of circadian rhythms can also lead to many negative health impacts. Research shows that it may contribute to the causation of cancer, diabetes, heart disease, and obesity. Therefore, it is important to avoid exposure to blue light before bed to maintain a healthy sleep-wake cycle.
- Set an alarm that reminds you to turn off electronics two to three hours before bedtime.
- If you enjoy reading before bed, try using a lamp that emits red or orange light instead of blue light.
- Dim the brightness of your electronic screens, or use the "night mode" feature found on some devices.
- Try using a smartphone or computer application that can help reduce blue light emission.
- If there are light sources in your bedroom that you are unable to dim or turn off, try using an eye mask to block them out once you are in bed.
- If you work a night shift or use a lot of electronic devices at night, consider wearing blue-blocking glasses or installing an app that filters the blue/green wavelength at night.
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Maintain a consistent sleep schedule
Maintaining a consistent sleep schedule is key to resetting your body's internal sleep-wake clock, or circadian rhythm. This 24-hour cycle is governed by the body's "master clock", located in the hypothalamus region of the brain.
The circadian rhythm is influenced by environmental factors, such as light and darkness. As such, exposure to natural light in the morning can promote better synchronisation of your internal clock, while keeping lights on late into the evening can disrupt your body's transition to sleep. Blue light from digital devices like smartphones and computers can also impact your circadian rhythm, so it's best to avoid screens in the hours before bed.
To maintain a consistent sleep schedule, it's important to wake up at the same time every day and avoid sleeping in, even on weekends. This provides a clear signal to your brain and helps to establish a healthy sleep pattern. It's also beneficial to create a sleep environment that is conducive to rest, such as by finding a comfortable mattress and avoiding spicy, fatty, and sugary foods before bed, which can cause indigestion and heartburn.
Resetting your body's sleep-wake clock may take some time, especially if you have been travelling across time zones or dealing with a condition like Delayed Sleep Phase Syndrome (DSPS). However, with discipline and a consistent sleep schedule, it is possible to adjust your body's internal clock and improve your sleep quality.
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Avoid eating close to bedtime
Eating too close to bedtime can have a direct effect on your quality and quantity of sleep. This is because the body's internal clock, or circadian clock, which manages our sleep/wake cycles, is influenced by the food we eat and when we eat it.
Firstly, eating a large meal before bed can cause bloating and discomfort. Spicy and fried foods can cause heartburn or gastroesophageal reflux disease (GERD). GERD is a condition in which the acid from the stomach comes up into the oesophagus, causing irritation, regurgitation of food, a sore throat, and difficulty swallowing. This irritation of the throat causes inflammation, which tightens the airway, making it more susceptible to collapse. Eating late can also aggravate sleep-related breathing disorders like sleep apnea.
Secondly, eating a meal high in fat and carbohydrates less than an hour before bedtime can extend the time it takes to fall asleep. By contrast, eating meals high in carbohydrates at least four hours before bedtime can help you fall asleep faster. Eating right before bed can also cause you to wake up in the middle of the night.
Thirdly, there is a link between the health of the gut microbiome and sleep. The gut has its own nervous system, the enteric nervous system (ENS), which releases neurotransmitters and hormones and keeps foreign invaders out of the body. However, imbalances in this environment can lead to harmful conditions like leaky gut syndrome, which increases inflammation and the body's need to fight off foreign invaders. As the gut microbiome is regulated by the circadian clock, and inflammation affects sleep quality, sugar and other dietary choices can ultimately impact your sleep.
Finally, eating a bedtime snack can curb hunger and help you feel satiated until morning. If you are feeling peckish, reach for a light snack like tart cherries or kiwis, which have been shown to promote sleep.
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Exercise regularly, but not too close to bedtime
Exercise has been proven to promote healthy sleep. It can promote relaxation, reduce anxiety, and normalize your internal clock. Even mild physical activity like going for a walk can be beneficial and is a great opportunity to get daylight exposure.
However, the timing of your exercise is important. It is recommended that you finish your workout at least one hour before bedtime, and preferably 90 minutes before. This will give your body enough time to wind down. Vigorous workouts should be avoided in the evening as they can stimulate your nervous system and raise your heart rate too much, making it difficult to fall asleep.
If you are doing light to moderate-intensity activity, this may even help you fall asleep faster and get better quality sleep. Aim for at least 30 minutes of moderate-intensity aerobic activity during the day or evening. Regular exercise is essential for continuous sleep benefits. Strive for 150 minutes of moderate-intensity aerobic exercise every week.
It is also important to be mindful of the type of exercise you are doing and how it affects your sleep. For example, aerobic exercise causes the body to release endorphins, which can create a level of activity in the brain that keeps some people awake. These individuals should give themselves at least one to two hours before bed, allowing endorphin levels to wash out and "the brain time to wind down."
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Frequently asked questions
Resetting your sleep-wake cycle involves manipulating light exposure, particularly for disturbances caused by jet lag. Light exposure is an essential influence on the circadian rhythm, which is closely aligned with the day-night cycle. When the eyes are exposed to light, the brain sends signals associated with wakefulness.
The circadian rhythm is a 24-hour cycle that helps manage the balance between sleep and wakefulness. It is controlled by a "master clock" in the brain, located in a part of the hypothalamus called the suprachiasmatic nucleus (SCN).
Light exposure plays a crucial role in resetting the sleep-wake cycle. The daily cycles of light and darkness act as cues for the mechanisms of the sleep clock and circadian rhythm. Light exposure in the morning can promote better synchronisation of the internal clock.
The time it takes to reset the sleep-wake cycle depends on the underlying cause. For jet lag, the general rule is one day per time zone, but it can take up to two weeks for longer trips. For conditions like Delayed Sleep Phase Syndrome (DSPS), it may take one to two months to reset the cycle.
Apart from manipulating light exposure, other lifestyle changes can help reset the sleep-wake cycle. These include maintaining a consistent sleep schedule, avoiding screens and blue light before bed, exercising regularly, and eating meals at consistent times.
