Circadian Rhythm Sleep Disorders

Treating circadian rhythm sleep disorders is not simply about getting more sleep, but about shifting your sleep to the right time.

Because these conditions are driven by a mismatch between your internal clock and the external world, the focus is on resetting and stabilising your body’s timing system. Research shows this is best achieved through a combination of light exposure, consistent daily habits, and, in some cases, carefully timed support such as melatonin. Small lifestyle adjustments, such as reducing alcohol before bed, can also help support more stable sleep patterns.

Building consistent daily habits is one of the most effective ways to stabilise your body clock over time.

Use light to reset your body clock

Light is the strongest signal your body uses to control sleep timing.

• Morning light helps move your rhythm earlier
• Evening light delays your rhythm

For example, when dealing with jet lag sleep disorder, exposure to daylight at the correct local time can significantly speed up adjustment. People with shift work sleep disorder often need to actively manage light, using brightness during their working hours and reducing light on the way home.

Natural daylight is ideal, but in some cases, light therapy can be used to provide structured exposure when needed. Light therapy involves using a specialised bright light box at specific times of day to help reset your body clock and shift your sleep timing.

Control your sleep environment

Your environment needs to match your sleep timing, even if that timing is unconventional.

• If you sleep during the day, common with shift work, make your room completely dark, even if it’s morning. Use blackout blinds and/or an eye mask
• Keep your sleep space cool and quiet
• Create consistent cues that signal sleep

Keep your schedule consistent

Your circadian rhythm relies on repetition.

• Wake up at the same time each day, your strongest anchor
• Keep sleep and wake times as stable as possible
• Avoid large swings between workdays and rest days

Reduce light and stimulation before sleep

Artificial light, especially from screens, can delay melatonin release and push sleep later.

• Dim lights before bed
• Reduce screen exposure 1–2 hours before sleep
• Create a simple wind-down routine

If you are sleeping during the day, treat that period like night, minimise light and stimulation as much as possible.

Align daily habits with your sleep timing

Your body clock is influenced by more than just sleep.

• Eat meals at consistent times
• Exercise regularly, aligned with your wake period
• Keep routines predictable

These cues help reinforce your internal timing, particularly when adjusting to travel or shift work patterns. 

Consider carefully timed melatonin

Melatonin is the hormone your body naturally releases to signal sleep.

When used correctly, low-dose, well-timed melatonin may help shift your circadian rhythm, particularly for travel across time zones, rotating or night shifts, and delayed sleep timing. You can read more about how it works, when to take it, and who it may help in our guide to melatonin for sleep.

However, timing is critical. Taken at the wrong time, it can push your body clock further out of sync.

Seek support if needed

If your sleep remains persistently out of sync with your life:

• A healthcare provider or sleep specialist can assess your pattern
• Rule out other sleep disorders
• And guide treatment, including light therapy or melatonin timing

With the right combination of light, timing, environment, and consistent habits, it is possible to gradually realign your body clock, improving sleep, energy, and overall well-being.⁽¹˒²⁾