Your genes or working late at night may influence your circadian rhythm. However, some methods of changing your sleep schedule are more effective than others. For example, consuming alcohol is a less effective strategy. While alcohol may initially make you feel drowsy, it is a central nervous system depressant that can reduce sleep quality and duration, leading to unrefreshing and fragmented sleep.
Sleep medications might not be a reliable long-term solution for sleep problems. Although they can help you adjust to a new sleep schedule or cope with a stressful period that interferes with your sleep, they are only a temporary fix and cannot reset your body’s internal clock (circadian rhythm). Additionally, some sleep medications may leave you feeling groggy upon waking. To effectively reset your circadian rhythm and improve your sleep-wake cycle, it is recommended to implement the following techniques:
What Are Good Techniques to Help Adjust Your Circadian Rhythm?
It is common for people to want to adjust their sleep-wake cycles and circadian rhythms for various reasons. For example, some may need to make changes after starting a job that requires them to work at odd hours. To effectively reset your circadian rhythm and improve your sleep-wake cycle, consider the following techniques:
- Wake up at the same time every day, even if you didn’t sleep well.
- Use bright light therapy to reorient your circadian rhythm, especially if you work irregular hours.
- Take melatonin supplements to help reschedule your circadian rhythm, but consult a sleep specialist before taking them.
- Adjust your mealtimes to regulate feelings of hunger and digestion.
- Exercise regularly, but avoid working out within 1-2 hours of bedtime.
- Moderate your caffeine intake, especially before bedtime.
If you want to change your sleep schedule, it’s best to consult a doctor or sleep specialist to determine the safest and healthiest measures that are right for you.
What Causes Circadian Rhythm Sleep Disorders?
The master circadian clock in healthy adults operates on a daily cycle, resetting approximately every 24 hours. Circadian rhythm sleep disorders occur when a person experiences delays, advances, or complete dysregulation of their circadian cycle. These disorders can manifest in various ways, but disturbed sleep and excessive daytime sleepiness are common symptoms. Some disorders result from timing issues in a person’s internal timekeeping system.
Delayed or Advanced Sleep-Wake Phase Disorder
This disorder occurs when a person’s sleep-wake cycle is at least two hours later or earlier than traditional circadian schedules.
Irregular Sleep-Wake Rhythm Disorder
This disorder is characterised by fragmented sleep-wake patterns, leading to disturbed sleep and grogginess during wakefulness. It is often seen in individuals with neurodegenerative conditions like Alzheimer’s disease and Parkinson’s disease.
Other Circadian Rhythm Disorders
These disorders occur due to misalignments between a person’s circadian clock and their external environment. Shift work disorder is common among people who work late at night or early in the morning, causing excessive daytime sleepiness and difficulty falling asleep at their scheduled bedtime.
Jet Lag
Jet lag is another example of a circadian rhythm disorder, affecting people who travel across multiple time zones in a short period. It temporarily causes fatigue and disrupts sleep as the body adjusts to the new local time.
How Are Circadian Rhythm Disorders Diagnosed and Treated?
Most circadian rhythm sleep disorders are diagnosed after symptoms persist for at least three months. While each condition requires a specific diagnosis, many can be treated by slep specialists eusing techniques such as light exposure therapy and melatonin supplements. Improving sleep hygiene and maintaining a consistent bedtime schedule can also be effective. If left untreated, these disorders can negatively impact a person’s physical, cognitive, professional, and social performance.
What Do Circadian Rhythms Have to Do with Health?
The human body has internal clocks that regulate various bodily functions and are linked to the master body clock in the brain. These clocks are known as circadian rhythms, and when they are disrupted, it can lead to numerous health issues.
Digestion and Immune System
The sleep-wake rhythm is one of the key circadian rhythms because processes such as appetite hormone production, digestion, and immune system function are designed to be active when we are awake and slow down when we are asleep. Circadian rhythms are fundamental to our biology, and any disturbance to them can impact multiple bodily systems.
For instance, the digestive system has its own circadian rhythm. After waking, the body releases certain hormones that make us feel hungry and aid in the breakdown and digestion of food. These processes slow down during sleep. When we eat too early or too late in the day, fewer digestion-aiding hormones are available, making it harder for the body to regulate blood sugar and absorb and store nutrients from food. This behaviour may increase the risk of obesity and diabetes, according to some research.
Additionally, disturbances in circadian clocks within individual cells may contribute to the development of cancer, as cells could begin dividing at inappropriate times.
