Circadian Health
10 mins

How to Find Your Circadian Rhythm: A Comprehensive Guide

Written by AYO Team

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How to Find Your Circadian Rhythm: A Comprehensive Guide
Table of contents

Key Takeaways

  • Recognizing and aligning with your circadian rhythm is essential for improving sleep quality and overall health.
  • Conducting a week-long experiment to track sleep patterns and daily activities provides valuable insights into your natural sleep-wake cycle, allowing for adjustments to optimize sleep and well-being.
  • Implementing consistent sleep schedules, reducing (blue) light exposure before bedtime, and creating a sleep-conducive environment can help maintain a healthy circadian rhythm.
Rhythm is a crucial part of our lives and well-being.

And we’re not talking about your dance moves at the club but a type of rhythm that regulates our bodies’ most important biological processes called circadian rhythm.

If it is out of sync with the environment, you start experiencing consequences, such as irregular sleep, mood swings, and fatigue.
Additionally, when chronically out of sync, you are at an increased risk of long-term health hazards like cardiovascular disease, neurodegenerative diseases, cancer, metabolic disorders, etc.
In this article, we’ll explore briefly what the circadian rhythm is and how to find yours with practical examples.
Let’s dive right into the article.

What Is Circadian Rhythm?

Circadian rhythm, often called your body’s internal clock, is a natural, internal process that among other things, regulates the sleep-wake cycle and repeats roughly (hence circa-dian) every 24 hours.

This rhythm is generated in a brain region called the suprachiasmatic nucleus (SCN) and is
influenced by light exposure mainly.

The SCN, located in the hypothalamus, receives neuronal input from the eyes and adjusts your body’s rhythms according to the amount of light you’re exposed to.
This master clock coordinates with peripheral clocks found in nearly every tissue and organ, ensuring that your physiological processes are synchronized with the day-night cycle.
Did you know?
Try to eat meals at consistent times each day to help regulate your body clock.

Chronotypes and Circadian Rhythm

Have you ever heard the saying ‘’being a morning person?’’

A “morning person” is typically more productive during the early hours of the day, and according to recent studies, being a “morning” or “evening” person might be rooted in genetics.

This genetic predisposition is part of what scientists call chronotypes, representing individual differences in circadian rhythm preferences.
Three main chronotypes are distinguished:
  • Morning-types (M-types).
  • Evening-types (E-types).
  • Neither-types (N-types).
M-types, often called “early birds,” prefer earlier sleep and wake times and tend to be most alert in the morning hours.
E-types, known as “night owls,” favor later sleep and wake times and typically experience peak alertness in the evening.
N-types, tend to fall between these two extremes, showing no strong preference for either morning or evening.
Research indicates that the adult population’s chronotype distribution is approximately 60% N-types, with the remaining 40% split between M-types and E-types.
These innate preferences influence sleep patterns and impact cognitive function, physical performance, and even personality traits.
Why is this important?
Understanding your chronotype can be valuable for optimizing daily schedules, improving sleep quality, and potentially mitigating health risks associated with circadian misalignment.
Once you know which chronotype you are, it’s much easier to plan your routine based on the time windows you feel more or less productive.

How to Find Your Natural Circadian Rhythm

Your circadian rhythm is like a clock, as long as you keep it wound and running smoothly with consistent routines and healthy habits, it’ll help you maintain optimal physical and mental health.
Here are some practical steps to help you identify and maintain your natural sleep-wake cycle.

1. Maintain a Consistent Sleep Schedule

Establishing a regular sleep schedule is crucial for aligning your circadian rhythm. Go to bed and wake up at comparable times every day, even on weekends, as consistency helps reinforce your body’s natural sleep-wake cycle.

Tip: Aim for 7-9 hours of sleep per night. Leave the bed when you wake up in the morning, avoid using the snooze button or alarm clock at all, and try to avoid napping during the day.

2. Wake Up Naturally

This can be hard, especially if you have a job and a family. But, when you don’t need an alarm, pay attention to when you wake up naturally. Your body’s preferred wake-up time is crucial to fix your circadian rhythm.
  • Tip: Test your natural wake times on the weekends for a few weeks.

3. Keep an Eye on Your Energy Levels

Observe when you naturally feel the most alert and awake during the day. Do you feel more energetic in the morning, afternoon, or evening? This can provide valuable insight into your natural sleep-wake patterns.
  • Tip: Record this in a journal for at least two weeks in a row. The more weeks you record, the more accurate the results.

4. Limit Exposure to Bright and Blue Light Before Bedtime

Bright and especially blue light from screens (phones, computers, TVs) can interfere with melatonin production and your level of alertness, making it harder to fall asleep.
  • Tip: Avoid screens at least an hour before bed. Consider using blue light-blocking glasses, dimming the screen, or enabling night mode on your devices.

5. Create a Sleep-Conducive Environment

Your sleep environment plays a significant role in the quality of your sleep. Ensure your bedroom is dark and quiet.
  • Tip: Use blackout curtains to block out light, keep the room temperature between ~67°F (~19°C), and use earplugs.

6. Monitor Your Exposure to Natural Light

Natural light exposure during the day, especially in the morning, helps regulate your circadian rhythm.
  • Tip: Spend time outside during daylight hours, and try to get at least 30 minutes of sunlight exposure each day. In the evening, dim the lights to signal your body that it’s time to wind down.

7. Be Mindful of Your Diet and Exercise Routine

When you eat and when you exercise can impact your circadian rhythm.

  • Tip: Avoid heavy meals, caffeine, and alcohol close to bedtime. Regular physical activity can help you fall asleep faster and enjoy deeper sleep, but try not to exercise too late in the evening.

8. Establish a Relaxing Pre-Sleep Routine

A calming bedtime routine can signal to your brain that it’s time to prepare for sleep.
  • Tip: Before bed, engage in relaxing activities such as reading, taking a warm bath, or practicing meditation or deep breathing exercises.

9. Track Your Sleep Patterns

Keeping a sleep diary can help you identify patterns and factors that affect your sleep.
  • Tip: Note your sleep and wake times, along with any activities, foods, or stressors that might impact your sleep. This information can be valuable for identifying trends and making necessary adjustments.

You will know your circadian rhythms are in sync when you have stable, regular sleeping patterns. You fall asleep quickly, get a full 7-9 hours of sleep, and wake up rested at about the same time every day.

Did you know?
Your body typically starts producing melatonin about 2 hours before your regular bedtime.

The Weekly Experiment to Reset Your Circadian Rhythm

To help you better understand your circadian rhythm, here’s a simple week-long experiment you can conduct.
By tracking your sleep patterns and related activities, you can identify trends and make adjustments to align with your natural rhythm.
Here are some materials you’ll need before we start the experiment:
  • A notebook
  • A consistent bedtime and waketime

Now, here are the crucial things you should keep track of and note down for this experiment to be successful:

  • Set a Consistent Sleep Schedule: Choose a bedtime and wake time that allows for 7-9 hours of sleep. Stick to this schedule every day, even on weekends.

  • Track Sleep and Wake Times: Record when you go to bed and wake up. Note any awakenings during the night and how long you were awake.

  • Monitor Daily Activities: Record your meals, exercise, and significant activities. Note the time and duration of each activity.

  • Limit Bright and Blue Light Exposure: Avoid screens at least one hour before bedtime. If you must use screens, use blue light filters or wear blue light-blocking glasses.

  • Try sleep-conductive activities before bed: For example, meditating or reading a book.

  • How you felt upon waking: refreshed, groggy, etc.

  • Any difficulties falling asleep or staying asleep.

  • Stress levels and mood throughout the day.

Once you have all these written down for the first week, analyze your sleep patterns at the end of the week.
For example, compare how different activities, diet, and stress levels affected your sleep quality. Or, look for trends in how you felt upon waking and throughout the day.
Make small changes to your schedule or habits weekly based on these observations. Then, keep tracking for another week to see if these adjustments improve your sleep. Keep doing this experiment until you fix your circadian rhythm.
Here’s an example of a typical journal entry following the structure above:

Date: July 7

Bedtime: 10:30 PM

Wake Time: 6:30 AM

Night Awakenings: 2 (total 15 minutes)

Daily Activities:

  • 7:00 AM: Breakfast (oatmeal, coffee)
  • 12:30 PM: Lunch (salad, chicken)
  • 5:30 PM: Dinner (pasta, vegetables)
  • 6:00 PM: 30-minute walk
  • 9:00 PM: Reading

How I Felt Upon Waking: Groggy

Mood and Stress Levels: Moderate stress, felt productive

Comments: I slept better after reading before bed.

Did you know?
A short nap of 12-15 minutes can boost alertness and performance without interfering with your nighttime sleep. Naps longer than 15 minutes can lead to sleep inertia, making you feel groggy upon waking.

Find the Right Rhythm for Your Body

Keeping your internal clock in sync is one of the most important things you can do for your well-being.
No matter how out of sync your circadian rhythm is, following practical guides like the ones in this article will always help you get it back on track.
Try the experiment for a few weeks, and let us know if you notice significant changes in your overall sleep, mood, and well-being.

And if you found this helpful article, check out our other content here.

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