Sleep Disorders

Circadian Rhythm Disorders

When your internal body clock drifts out of step with the day, sleep can feel impossible at the "right" time — even when you're exhausted. The clock can be reset.

Take the 2-minute quiz Book an appointment

SPMedically reviewed by Sarah Patel, MD · Board-certified, fellowship-trained in Sleep Medicine

Ready to reset your clock?

New patients seen in-office or by telehealth, usually within the week.

Book an appointment

Most insurance accepted · (602) 206-6262

What is a circadian rhythm disorder?

Your body runs on an internal 24-hour clock — your circadian rhythm — that tells you when to feel alert and when to feel sleepy. It's set mainly by light and darkness. A circadian rhythm disorder happens when that clock is out of sync with the world around you, so your natural sleep and wake times don't line up with the schedule you need to keep.

Importantly, this isn't insomnia in the usual sense. Many people with a circadian rhythm disorder sleep perfectly well — just at the "wrong" times. The problem is the timing, not the sleep itself.

The main types

Delayed sleep phase

Your clock runs late. You can't fall asleep until the early morning hours and struggle to wake for work or school. Common in teens and young adults.

Advanced sleep phase

Your clock runs early. You get sleepy in the early evening and wake long before dawn, unable to fall back asleep. More common with age.

Shift-work disorder

Night or rotating shifts force you to sleep against your natural rhythm, causing insomnia during the day and sleepiness on the job.

Jet lag

Fast travel across time zones leaves your clock behind, with poor sleep, fatigue and fogginess until your body catches up.

Non-24-hour rhythm

Your clock drifts a little later each day and never locks onto a 24-hour cycle. Most often seen in people who are totally blind.

Irregular rhythm

No clear main sleep period at all — sleep is broken into short naps across the day and night. Linked to certain neurological conditions.

Common symptoms

1 Falling asleep much later or earlier than you want
2 Trouble waking at the time you need
3 Daytime sleepiness & low energy
4 Trouble focusing at work or school
5 Sleep that improves on days off or vacation
6 Mood changes, irritability & low motivation

Who it affects

Circadian rhythm disorders can affect anyone, but a few groups are especially prone to them:

Teens & young adultsA natural shift toward a later body clock during adolescence often collides with early school and work start times.

Shift & night workersNurses, first responders, warehouse and hospitality staff and many others must sleep against their body's natural signals.

Older adultsThe clock tends to run earlier with age, leading to early-evening sleepiness and very early waking.

Frequent travelersRegularly crossing time zones — or working across them from home — keeps the clock chronically unsettled.

How we diagnose it

Diagnosing a body-clock problem is mostly about understanding your patterns over time. A typical path with us looks like:

Consultation & sleep historyAn in-person or telehealth visit to review your symptoms, schedule and how your sleep shifts on free days.

Sleep diaryYou track your sleep, wake and energy for one to two weeks so we can see the true shape of your rhythm.

Actigraphy, if neededA comfortable wrist device may log your movement and light exposure over several days for an objective picture.

Results & planYour physician reviews the data with you and builds a timing plan tailored to your life and goals.

Why treating it matters

A misaligned clock touches more than your nights

When your schedule fights your biology night after night, the strain shows up during the day too — which is exactly why getting the timing right is worth it.

FocusPoorer concentration, memory & work performance

MoodHigher risk of depression & anxiety

SafetyMore drowsy driving & on-the-job accidents

HealthLinks to metabolic & heart strain over time

Good news

The clock can be reset — gently and steadily

Most circadian rhythm disorders respond well to a few well-timed changes. The key is doing the right things at the right hour, which is where a specialist makes the difference.

Timed light exposure

Bright light in the morning or evening — used at the correct time — is one of the strongest tools for nudging your clock earlier or later.

Discussed at your visit

Well-timed

Melatonin timing

Low-dose melatonin taken at a carefully chosen hour can help shift your rhythm. Timing matters far more than dose — we'll guide it.

Planned with your physician

Schedule shifting

A structured, gradual plan to move your sleep and wake times, paired with steady routines and smart light and screen habits.

Built around your life

For shift workers and frequent travelers, we also coach practical strategies — strategic napping, light and caffeine timing, and how to protect daytime sleep. And for specific patterns, medication has a role: a prescription melatonin-receptor medicine for non-24-hour sleep–wake rhythm — most common in people who are totally blind — or a wake-promoting medicine for shift-work disorder, always chosen and monitored by your physician.

Circadian rhythm FAQs

Is this just insomnia, or something different?

It's often different. With a circadian rhythm disorder, your sleep itself can be perfectly healthy — it just happens at the wrong time. That distinction matters, because the treatment focuses on shifting your timing rather than on sleep aids. A short sleep diary usually makes the difference clear.

Will melatonin fix it?

Melatonin can help, but only when the timing and dose are right — taken at the wrong hour it can even push your clock the wrong way. That's why we plan it as part of a full timing strategy rather than treating it as a simple sleeping pill.

My teenager can't fall asleep until 2am. Is that a disorder?

It can be delayed sleep phase, which is very common in teens because the body clock naturally runs later during adolescence. It's very treatable with a gradual schedule plan and well-timed morning light. We're happy to evaluate and build a workable plan for busy school schedules.

I work night shifts. Can you really help?

Yes. We can't change your schedule, but we can help your body cope with it — using strategic light exposure, caffeine and nap timing, and steps to protect your daytime sleep. Many shift workers feel meaningfully better with the right routine.

How soon can I be seen?

New patients are typically seen within the week, in person in Glendale or by telehealth anywhere in Arizona.

Sleep well. Be well.

Get your body clock back on your side.

Take the 2-minute assessment, or book directly with a sleep specialist.

Book an appointment Call (602) 206-6262