How to care for your circadian rhythm

Fixing your circadian rhythm

What is the difference between a biorhythm, a circadian rhythm and a body clock?

A biorhythm is simply any type of predictable cycle in a living organism. Some of these are well-known, like the circadian rhythm, which governs our sleep-wake phases. Circadian rhythms are found in most living things, including animals, plants, and many tiny microbes. Within this rhythm are physical, mental and behavioural changes that follow roughly a daily pattern. The term originates from Latin and literally means approximately (circa) daily (diem). Your circadian rhythm influences your sleep-wake cycle, daily patterns of alertness, mood and performance, hormones (such as melatonin and cortisol), and many other processes including digestion, heart rate, body temperature and lung function.

The circadian rhythm is often referred to as our body clock because it is the body’s innate timing device. This natural internal clock is affected by environmental cues, primarily light (but also temperature). Your body clock causes you to feel more energetic and alert during certain times of the day, and more lethargic and run down at other periods of the day. All humans have circadian rhythms, but there are slight differences in the length of the cycles, which is one of the reasons some people are ‘night owls’ and others are ‘morning people’.

Our circadian rhythm is managed by a part of the brain called the Suprachiasmatic Nucleus (SCN). Light travels to the SCN from the eye signalling that it is time to be awake. The SCN then triggers other parts of the brain that control hormones, body temperature and other functions that play a role in making us feel sleepy or awake.

human circadian rhythm

An example of a human body clock

Why are circadian rhythms important?

When a person’s circadian rhythm is disrupted, sleeping and eating patterns can run amok. Looking after your body clock will help prevent and help treat sleeping disorders and benefit your overall health. Irregular rhythms have been linked to several health problems, including obesity, diabetes, high blood pressure and cardiovascular disease. As well as contributing to mental health issues, such as depression, bipolar disorder and seasonal affective disorder. Recent research has also connected circadian rhythm disruption to Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, and autism spectrum disorder.

Even seemly small changes, like the beginning and end of Daylight Savings can disrupt our body clock. Statisticians have found there are more traffic accidents and workplace injuries when we move the clock forward and lose an hour of sleep. Furthermore, heart patients are at greater risk of myocardial infarction in the week following the Daylight Savings time shift.

Jet lag, shift work and your circadian rhythm

A change in the environmental light-dark cycles can speed up, slow down, or reset circadian rhythms. This is why jet lag confuses our bodies. Symptoms of jet lag should only last a few days and can include headaches, lethargy, irritability and reduced cognitive function.

Shift workers can experience a similar problem because the daily cues for the circadian rhythm do not match up with when a person is asleep and awake. This may lead to issues with sleep or other aspects of the person’s health.

What can you do to preserve your circadian rhythm?

Keeping your body’s daily cycle balanced and steady may be one of the most positive things you can do for your overall health, so here are some actionable tips to keep yours on track.

1.   The best way you can support your natural circadian rhythm is to keep a routine according to the Sleep Health Foundation. As much as possible, go to bed at the same time and wake up at the same time every day. Unfortunately, this also means ditching your Sunday sleep in.

2.   Avoid artificial light after sundown. The light emitted from our computers, phones, TVs, and even fluorescent light bulbs can interfere with our body clocks by tricking the body into thinking it is daytime. Try dimming the lights in the evening and having a technology free period before bed. Professor Lockley from the Alertness CRC suggests making your sleep space as dark as possible or using an eye mask.

3.   Get as much natural light as you can during the day, particularly in the morning. Open the windows, eat lunch outside, go for a short walk, take the window seat on the train or work outside.

4.   Physical activity is another cue for your body clock that it is time to be awake. So, get your large joints moving in the morning with some exercises or stretches.

5.   Dr Felino Cagampang from the University of Southampton reported that digestion and metabolism play a role in maintaining your circadian rhythm. He says that ideally, we should be eating during daylight and fasting when it is dark outside. This won’t always be practical but maybe you could consider an earlier dinner. He also recommends making breakfast the biggest and most nutritional meal of the day.

6.   Certain foods that send conflicting cues to your body clock are best avoided in the afternoon and evening. These include caffeinated drinks, alcohol, foods high in saturated fats, and sugary food or drinks.

7.   Finally, get enough sleep to keep your circadian rhythm in check. For most adults this is at least 7 hours of sleep.

Recommended sleep chart from the National Sleep Foundation

Recommended sleep chart from the National Sleep Foundation

Tips for resetting your body clock

Sometimes life gets in the way and our body clocks fall out of sync, due to travel, work, stress, children, social commitments, illness or other factors. Here are a few ways to reset your body clock when it has gone off course.

  • Take the family camping. This is the perfect way to get plenty of light during the day and minimal artificial light at night. If you take a mobile phone, save it for emergencies.
  • Make gradual changes until you have your groove back. Research suggests adjusting your current sleep schedule by no more than 30 minutes per day and remain on that schedule for a few days or even weeks, so your body catches up. For instance, if you are in the habit of going to sleep at 2am, try 1:30am for a week and after that bring it forward to 1am.
  • If you are recovering from jet lag, try this free app which calculates the best times to be exposed to light and darkness to get back on track.

Please note:  This article is not to be used as medical advice.  Always speak to a medical professional before taking supplements to make sure they are right for you.   This post may contain affiliate links.

Ways to care for your circadian rhythm
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22 replies
  1. Emily Tychsen says:

    Don’t forget to follow essential sleep hygiene principles during, and after, your sleep clock reset. If improving sleep hygiene doesn’t help or your sleep schedule is impacting your daily life, you may also want to reach out to your doctor or sleep specialists. They would be able to help you set up a plan, suggest supplements and diagnose any sleep disorders or underlying conditions to help you fix your sleep cycles.

  2. Jessica says:

    A circadian rhythm is a biological rhythm that takes place over a period of about 24 hours. Our sleep-wake cycle, which is linked to our environment’s natural light-dark cycle, is perhaps the most obvious example of a circadian rhythm, but we also have daily fluctuations in heart rate, blood pressure, blood sugar, and body temperature.

  3. Rhys says:

    Very important and useful information thank you. I love the camping tip. I used to go camping a lot as a child an i always felt better after it. now i know why.

  4. Tiffany Khyla says:

    I’m so bad about keeping a regular sleep schedule. I really need to be better about having a routine and not breaking it in such large ways so often. Great tips here!

    • TheDeepSleepCo says:

      It’s not always easy to keep a regular routine. Try writing down your routine and sticking to it as much as you can.

  5. Susan Minich says:

    I didn’t think about the connection with daylight saving time changes – UGH! Now I know why I feel so awful! Great information here! Now if I could only get in bed at the same time every night!

    • TheDeepSleepCo says:

      I know that some of the tips are just not always practical in the real world. We can only do the best we can. There are some crazy stats out there on the effect of daylight savings time changes on crime, illness and accidents.

  6. Princy Khurana says:

    this is the first time i am reading something on this subject and i must confess, this was an eye opener and very informative

  7. Vicki says:

    Great information for a person like me who suffers from insomnia, it can be so difficult to stay in a good sleep pattern, but it’s so worth the effort.

    • TheDeepSleepCo says:

      Thanks for reading. definitely agree that keeping a good sleep pattern is hard! and modern technology does not make it easier. But yes – it is worth the effort. Well said.

  8. Marnie says:

    No wonder new mums feel so out of whack- our deepest sleep period is 2am when we’re most likely getting a wake up call from the new baby!! Great info thanks.


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