A sleep study can help explain why you’re still tired, even after what seems like a full night’s sleep. Constant exhaustion is often linked to hidden sleep disorders. Many people struggle for years without knowing the real cause. If you’re always running on empty, it’s time to get answers that lead to real solutions.

How Tired Is Too Tired?

Everyone gets tired. But chronic, unrelenting exhaustion, despite getting what seems like “enough” sleep, is a different story. Fatigue becomes a medical concern when it affects your function, mood, memory, or ability to stay awake during the day. If you’re falling asleep at work, zoning out mid-conversation, or nodding off at red lights, this isn’t normal. It’s a warning sign.

According to the Centers for Disease Control and Prevention (CDC), 1 in 3 adults in the U.S. doesn’t get enough sleep on a regular basis (1). Even more troubling, many people who sleep for 7–8 hours still wake up feeling drained. That points to sleep quality, not just quantity.

Here’s how you know your tiredness isn’t typical:

  • You need naps or caffeine to get through the day
  • You snore loudly, gasp during sleep, or wake up choking
  • You feel foggy, irritable, or mentally sluggish
  • You fall asleep unintentionally during the day (e.g., watching TV, driving)
  • You wake up multiple times a night or too early in the morning
  • You’ve been told you stop breathing in your sleep

These symptoms may indicate underlying conditions like sleep apnea, insomnia, narcolepsy, or other sleep-wake disorders. Left untreated, these issues do more than ruin your energy. They increase your risk for heart disease, stroke, type 2 diabetes, and depression.

What Can a Sleep Study Reveal?

Sleep studies don’t just “monitor” your sleep, they uncover why you aren’t functioning during the day. They measure how your brain, body, and vital systems behave during sleep. This allows your sleep specialist to spot what you can’t see.

A sleep study can diagnose:

  • Obstructive Sleep Apnea (OSA): A condition where your airway repeatedly collapses during sleep. It affects an estimated 39 million U.S. adults, and up to 80% remain undiagnosed (2).
  • Insomnia: Especially in complex, treatment-resistant cases, where brain activity during the night needs to be assessed.
  • Narcolepsy: A neurological condition that causes excessive daytime sleepiness and sudden sleep episodes.
  • Parasomnias: Unusual behaviors during sleep, including sleepwalking, night terrors, or REM behavior disorder.
  • Periodic Limb Movement Disorder (PLMD): Involuntary leg jerks that disrupt deep sleep, often without the person knowing.
  • Circadian Rhythm Disorders: When your sleep-wake cycle is misaligned with your environment, common in shift workers or teens with delayed sleep phase syndrome.

Sleep studies also reveal whether your body reaches and sustains the restorative stages of sleep, especially deep sleep (slow-wave sleep) and REM sleep. If you skip these stages or are constantly pulled out of them, you’ll feel unrested, regardless of how long you sleep.

What Happens During a Sleep Study?

It’s not as intimidating as it sounds. A sleep study, also known as polysomnography, is a non-invasive, overnight test performed either at home or in a sleep laboratory. It tracks brain waves, oxygen levels, heart rate, breathing effort, and muscle activity, all while you sleep naturally.

In a lab setting, you’ll sleep in a private, quiet room that resembles a hotel suite more than a hospital. Small sensors are placed on your scalp, face, chest, limbs, and finger. These painless electrodes capture detailed data in real time.

A trained sleep technologist observes your sleep remotely and ensures the equipment works throughout the night. You can bring your own pillow, wear your usual sleepwear, and use the restroom as needed.

Common types of sleep testing include:

  • Polysomnography (PSG): The gold standard for diagnosing sleep apnea, limb movement disorders, and parasomnias.
  • Home Sleep Test (HST): A simplified version used primarily for screening sleep apnea. Less detailed but more convenient. However, it misses 1 in 5 cases due to its limited channels.
  • Multiple Sleep Latency Test (MSLT): Performed the day after an overnight study. It measures how quickly you fall asleep during several nap trials, used to diagnose narcolepsy.
  • EEG-based Home Sleep Profiling: A newer tool for identifying insomnia patterns and sleep depth over several nights at home.

Afterward, a board-certified sleep physician interprets the data and explains your diagnosis, along with a step-by-step treatment plan.

If You’re Tired All the Time, Get a Sleep Study

When Should You Schedule a Sleep Study?

The short answer is sooner than most people think. Sleep disorders are slow to develop and easy to ignore, but their consequences build fast.

Schedule a sleep study if:

  • You feel tired every day, no matter how much sleep you get
  • You or your partner notice loud snoring, gasping, or pauses in breathing
  • You’ve been diagnosed with high blood pressure, diabetes, or heart disease and also have sleep issues
  • You wake frequently at night or struggle to fall asleep
  • You’ve tried sleep hygiene strategies without success
  • You fall asleep unintentionally during the day
  • You’ve been living in a fog and just can’t seem to snap out of it

Sleep studies are especially urgent if you drive for work, operate heavy machinery, or work in healthcare, or any other field where alertness is essential. According to the AAA Foundation for Traffic Safety, drowsy driving causes an estimated 328,000 crashes each year in the U.S (3). Many of these could be prevented with a proper sleep diagnosis and treatment.

Delaying a sleep study may allow chronic health issues to worsen. Sleep affects every system in your body: immune function, metabolism, mental health, cardiovascular stability, and hormone balance.

Can I Just Try Fixing My Sleep on My Own?

You can try, but you might waste months (or years) chasing the wrong solutions.

Yes, sleep hygiene matters. Regular bedtimes, dark environments, and avoiding screen time help. But these surface-level fixes won’t resolve sleep apnea, narcolepsy, or PLMD. These are medical conditions, no amount of chamomile tea or melatonin will fix them.

Without a sleep study, you may be just treating symptoms in the dark.

How Do I Know If I Qualify for a Sleep Study?

If you’re asking this, chances are, you already do.

You may qualify if you:

  • Wake up tired, even after 7–9 hours of sleep
  • Snore loudly or gasp during sleep
  • Feel sleepy while driving or at work
  • Rely on caffeine or naps daily
  • Experience mood changes, brain fog, or memory lapses
  • Struggle with falling or staying asleep
  • Have high blood pressure, type 2 diabetes, or obesity with poor sleep

Most insurance providers cover sleep studies when symptoms suggest a sleep disorder. At our clinic, we guide you through this process, including insurance approval, paperwork, and required authorizations.

What Makes Us the Right Place to Get Tested?

The Insomnia and Sleep Institute of Arizona goes beyond “just a sleep lab.”

We operate at the level of an academic sleep center, offering advanced diagnostics, in-depth analysis, and a team of board-certified sleep medicine experts. Every evaluation starts with your story, your symptoms, your challenges, and your goals. Then we match that with real science and proven testing.

Here’s what sets us apart:

  • Real-time sleep monitoring in the sleep lab
  • Home and in-lab testing, depending on your needs and insurance
  • Pediatric expertise—children are tested in-lab only, with FDA-approved methods
  • The latest tools like the Sleep Profiler EEG for insomnia diagnosis
  • Clear diagnosis-to-treatment planning, explained step-by-step
  • Insurance navigation help from a dedicated benefits coordinator

We’ve helped thousands of Arizonans finally get the answers they need. Tired doesn’t have to be your normal. Let’s find out why and fix it, together.

References

  1. CDC. (2016). CDC Newsroom. CDC. https://archive.cdc.gov/www_cdc_gov/media/releases/2016/p0215-enough-sleep.html
  2. Faria, A., Allen, A. H., Fox, N., Najib Ayas, & Laher, I. (2022). The public health burden of obstructive sleep apnea. DOAJ (DOAJ: Directory of Open Access Journals), 14(3), 257–265. https://doi.org/10.5935/1984-0063.20200111
  3. Teen Drowsy Driving. (2025). Aadsm.org. https://www.aadsm.org/teen_drowsy_driving.php

 

Disclaimer: The information provided in this blog post is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a licensed healthcare provider for recommendations specific to your individual health needs.