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Published on: Apr 30, 2022
2 minute read
By: Second Medic Expert

What Is PET Scan ?

A PET scan (positron emission tomography) is a type of imaging test that uses a radioactive tracer to look for changes in the function of cells and tissues. A tracer is a substance that is introduced into the body to make it easier to see certain areas or organs. The radioactive tracer used in PET scans emits positrons, which are tiny particles that collide with electrons in the body. This creates gamma rays that can be detected by a scanner and used to create images of the inside of the body. PET scans are often used to diagnose cancer because tumor cells typically have higher levels of activity than normal cells. They can also be used to check for treatment response, measure tumor size, and identify new tumors.

PET Scan is a nuclear medicine imaging test that uses a small amount of radioactive material, called a tracer, to look for disease in the body. A PET Scan can show how well organs and tissues are working. It can help find cancer, heart problems, and other diseases. A Positron Emission Tomography (PET) scan is a medical imaging test that helps physicians diagnose and treat diseases. PET scans use a small amount of radioactive material, called a tracer, to help physicians see how organs and tissues are functioning. The radioactive tracer is injected into the patient's body and travels to the organ or tissue being studied. Physicians can then see where the tracer collects on an image of the organ or tissue.

A PET scan is helpful in diagnosing cancer, heart disease, brain disorders, and other diseases. It can also help determine how well treatment is working. PET Scan is an acronym for Positron Emission Tomography. It's a type of medical imaging that uses a small amount of radioactive material to help diagnose and treat medical conditions. A PET scanner creates 3D images of the inside of the body. PET (positron emission tomography) scans use a small amount of radioactive material called a tracer to help doctors see certain areas of the body. The tracer is injected into a vein, and images are taken as it moves through the body.

PET scans are often used to find cancer because tumors absorb more of the radioactive material than normal tissue does. PET scans can also be used to measure blood flow, check how well drugs work, and see how active the brain is. A PET scan is a type of imaging test that uses radioactive tracers to look at the function and structure of organs and tissues in your body. A small amount of radioactive material is injected into your bloodstream and then scanned by a special camera. The camera creates pictures that show where the material has collected. This can help doctors see how well an organ is working or find tumors or other problems.

PET scan is short for positron emission tomography. It's a type of medical imaging that uses a radioactive tracer to look at organ function or tissue metabolism. The tracer is a small amount of radioactive material that's injected into the patient's bloodstream. It collects in organs and tissues, and a scanner detects the radiation emitted as it decays. This information is used to create cross-sectional images of the body that show how the organs and tissues are working. PET scans are most often used to detect cancer because tumors consume more energy than normal tissue and therefore have a higher metabolic rate. But they can also be used to evaluate other problems, such as heart disease, brain function, and joint damage.

PET scanning is a type of nuclear medicine imaging. A small amount of radioactive glucose (FDG) is injected into a vein and images are taken as the glucose moves through the body. Cancer cells use more energy than normal cells and therefore absorb more of the radioactive glucose. This allows tumors to be visualized on the scan. PET stands for Positron Emission Tomography. A PET scan is a medical imaging test that uses a radioactive tracer to look at organs and tissues inside the body. The tracer is injected into a vein, and images are taken as it moves through the body.

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Why Do You Wake Up Tired Even After 8 Hours Sleep?

Getting 8 hours of sleep is often seen as the gold standard for good health. But what if you’re still waking up feeling groggy, exhausted, and low on energy—despite clocking in those 8 hours? If that sounds like you, you’re not alone.

In this blog, we’ll explore why you wake up tired even after 8 hours sleep, the possible reasons behind it, and simple ways to fix the issue so you can start your day refreshed and energized.

Sleep Quantity vs. Sleep Quality

It’s important to understand that sleep is not just about how long you sleep, but how well you sleep.

There are different stages of sleep your body goes through:

Light Sleep (Stage 1 & 2)
Deep Sleep (Stage 3)
REM Sleep (Stage 4) – where dreams and memory processing happen

If your sleep is constantly interrupted, or if you don’t get enough deep or REM sleep, your body and brain won’t be fully rested—even after 8 hours in bed.

7 Common Reasons You Wake Up Tired After a Full Night’s Sleep

1. Poor Sleep Quality

You may be lying in bed for 8 hours, but if your sleep is light or frequently interrupted, it won’t be refreshing. Common reasons include:

Noisy environment
Uncomfortable mattress or pillow
Room too hot or too cold
Lights or electronics nearby

Fix: Try blackout curtains, keep the room cool and dark, and follow a fixed bedtime routine.

2. Undiagnosed Sleep Disorders

Conditions like sleep apnea, restless leg syndrome, or insomnia can reduce sleep quality without you even realizing it.

Sleep apnea, for example, causes you to stop breathing for short periods during sleep. You may not wake up fully, but your body doesn’t get enough oxygen—leading to morning tiredness and brain fog.

Fix: If your partner says you snore heavily or you often wake up gasping for air, consult a doctor for a sleep study.

3. Too Much Screen Time at Night

Smartphones, laptops, and TVs emit blue light, which blocks melatonin—a hormone that helps you fall asleep.

If you scroll Instagram or binge-watch shows late at night, your brain might stay active even after you fall asleep.

Fix: Stop using screens 1 hour before bedtime. Use night mode or blue light filters if necessary.

4. Eating or Drinking Close to Bedtime

Heavy meals or caffeine before bed can disturb your sleep by causing indigestion, bloating, or increased alertness.

Fix: Avoid caffeine after 5 PM, and try to have your dinner at least 2 hours before sleeping.

5. Mental Health Issues

Conditions like stress, anxiety, or depression can impact sleep quality. You may sleep for hours but still wake up tired due to mental fatigue.

Fix: Practice stress management through:

Journaling
Breathing exercises
Meditation
Seeking therapy if needed

6. Vitamin or Hormonal Imbalance

Low levels of Vitamin D, Vitamin B12, iron, or thyroid dysfunction can cause constant fatigue—even with good sleep.

Fix: A simple blood test can help detect deficiencies. You can book these tests via SecondMedic.com, powered by Thyrocare, with home sample collection.

Recommended tests:

Vitamin D Test
Vitamin B12
Thyroid Profile
CBC (Complete Blood Count)

7. Lack of Physical Activity

Not moving your body enough during the day can lead to low-quality sleep at night. Exercise helps burn excess energy and improves deep sleep.

Fix: Aim for at least 30 minutes of physical activity, like walking, yoga, or cycling daily.

Signs That You’re Not Getting Good Sleep

You hit the snooze button multiple times
You feel sleepy by mid-morning
You wake up with a heavy head or sore body
You need coffee immediately to function
You feel irritated, anxious, or unmotivated

These are signs your body is not truly rested.

Simple Tips for Better Sleep & Morning Energy

Stick to a sleep schedule: Go to bed and wake up at the same time every day—even on weekends.
Create a sleep-friendly space: Keep your bedroom cool, quiet, and dark.
Limit naps: Daytime naps should be less than 30 minutes and before 3 PM.
Stay hydrated—but not too close to bedtime: Drinking too much water late may wake you up to pee.
Practice relaxation before bed: Try reading, light stretching, or herbal tea.

Conclusion

Feeling tired despite getting enough sleep can be frustrating. But remember, quality beats quantity when it comes to sleep. By making small changes in your routine, checking for hidden health issues, and improving your lifestyle, you can wake up feeling refreshed and ready to take on the day.

If you’ve been wondering why do you wake up tired even after 8 hours sleep, now you know where to start fixing it. Begin today with a better sleep routine—and better mornings will follow.

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