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The Science Behind Feeling Unrested

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March 13, 2025

The Science Behind Feeling Unrested: How to Fix Your Sleep Cycle

Medically reviewed by: 

Dr. Shiyan Ooi

School of Medical Sciences, University of Manchester

Introduction

Do you wake up feeling groggy and unrested, even after getting a full night's sleep? Sleep isn't just about quantity—it's about quality and consistency. Your sleep cycle plays a critical role in determining how refreshed you feel each morning.

In this guide, we'll explore the science behind why you might feel unrested, the key factors that disrupt sleep cycles, and effective ways to fix your sleep for better energy and focus.

Understanding Sleep Cycles

Sleep occurs in cycles that repeat every 90-110 minutes, consisting of four stages:

  • Stage 1: Light sleep, where your body begins to relax.
  • Stage 2: Deeper light sleep, where brain activity slows.
  • Stage 3: Deep sleep, crucial for physical recovery.
  • REM Sleep: Dreaming stage, essential for cognitive function and memory consolidation.

Disruptions in these cycles can leave you feeling fatigued and foggy, even if you sleep for 7-9 hours.

Why You Feel Unrested

1. Waking Up During Deep Sleep

If your alarm wakes you in the middle of deep sleep, you may experience sleep inertia, a state of grogginess and mental sluggishness.

Fix It:

  • Use a sleep tracking app to wake up at the end of a sleep cycle.
  • Keep a consistent sleep schedule.

2. Poor Sleep Quality

Factors like noise, light pollution, and temperature fluctuations can cause micro-awakenings that prevent you from getting restful sleep.

Improve It:

  • Keep your bedroom cool, dark, and quiet.
  • Use blackout curtains and white noise machines.

3. Circadian Rhythm Disruptions

Your circadian rhythm is your internal clock that regulates sleep. Irregular bedtimes, night shift work, or excessive screen time can throw it off balance.

Reset It:

  • Expose yourself to natural light in the morning.
  • Avoid blue light from screens at least an hour before bed.

4. Sleep Apnea or Other Disorders

Sleep disorders like sleep apnea or restless legs syndrome can disrupt your sleep cycles, leaving you unrested.

What to Do:

  • If you snore or wake up gasping, consider a sleep study.
  • Consult a doctor if you frequently wake up exhausted despite adequate sleep duration.

Learn more about sleep apnea

5. High Stress and Anxiety

Chronic stress and anxiety can keep your nervous system in a hyperactive state, making it difficult to reach deep sleep stages.

Reduce Stress Before Bed:

  • Practice deep breathing and meditation.
  • Try Cognitive Behavioral Therapy for Insomnia (CBT-I).

Explore CBT-I for better sleep

6. Poor Nutrition and Hydration

Deficiencies in magnesium, iron, and vitamin D can contribute to sleep disturbances. Dehydration can also lead to nighttime awakenings.

What Helps:

  • Eat nutrient-dense foods like leafy greens and nuts.
  • Stay hydrated but limit fluids close to bedtime.

Better Sleep with Sleep Reset

At Sleep Reset, we provide expert-designed, non-medication solutions to help you improve your sleep cycles and wake up refreshed. Our program includes CBT-I, personalized coaching, and proven sleep strategies.

Struggling with unrestful sleep? Take our sleep quiz to discover the best strategies for improving your sleep cycle.

Conclusion

Feeling unrested despite getting enough sleep is often due to poor sleep quality, disruptions in sleep cycles, or hidden sleep disorders. By optimizing your sleep environment, managing stress, and maintaining a consistent bedtime, you can wake up feeling truly refreshed.

For expert guidance, Sleep Reset offers personalized solutions to help you sleep better and feel more energized throughout the day.

Dr. Shiyan Ooi

Dr. Shiyan Ooi is a medical doctor with over a decade of experience treating patients with chronic conditions. She graduated from the University of Manchester with a Bachelor of Medicine and Surgery (MBChB UK) and spent several years working at the National Health Service (NHS) in the United Kingdom, several Singapore government hospitals, and private functional medicine hospitals. Dr. Ooi specializes in root cause analysis, addressing hormonal, gut health, and lifestyle factors to treat chronic conditions. Drawing from her own experiences, she is dedicated to empowering others to optimize their health. She loves traveling, exploring nature, and spending quality time with family and friends.