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  1. Stages of Sleep: What Happens in a Normal Sleep Cycle?

    Jul 25, 2025 · Healthy sleep consists of four stages. We break down the traits of both REM and NREM stages, how they differ, and how to get better sleep.

  2. Insomnia - Symptoms and causes - Mayo Clinic

    Jan 16, 2024 · Sleep-related disorders. Sleep apnea causes you to stop breathing at times during the night, disrupting your sleep. Restless legs syndrome causes a strong uncomfortable urge …

  3. Why Do We Need Sleep?

    Jul 10, 2025 · We tend to think of sleep as a time when the mind and body shut down. However, sleep involves many important and necessary processes.

  4. Sleep apnea - Symptoms and causes - Mayo Clinic

    Apr 6, 2023 · Overview Sleep apnea is a potentially serious sleep disorder in which breathing repeatedly stops and starts. If you snore loudly and feel tired even after a full night's sleep, you …

  5. 100+ Sleep Statistics - Facts and Data About Sleep 2024 - Sleep …

    Jul 10, 2025 · Looking for the facts about sleep? Our in-depth look at sleep statistics gives hard data about sleep needs, disorders, and the impacts of sleep deprivation.

  6. Melatonin side effects: What are the risks? - Mayo Clinic

    Oct 28, 2022 · Is melatonin a helpful sleep aid — and what should I know about melatonin side effects? The hormone melatonin plays a role in the sleep-wake cycle. Natural levels of …

  7. What Is the Best Sleeping Position? - Sleep Foundation

    Jul 25, 2025 · Are you waking up in pain? It could be your sleep position. Learn about the pros and cons of different positions, and find the best sleeping position for you.

  8. Hydroxyzine (oral route) - Side effects & dosage - Mayo Clinic

    Dec 1, 2025 · Description Hydroxyzine is used to help control anxiety and tension caused by nervous and emotional conditions. It can also be used to help control anxiety and produce …

  9. What Conditions Can Cause Excessive Daytime Sleepiness? - Sleep …

    Oct 28, 2025 · Conditions such as neurological disorders, mental health issues, and sleep disorders like obstructive sleep apnea can all contribute significantly to excessive daytime …

  10. Fibromyalgia - Symptoms & causes - Mayo Clinic

    Apr 26, 2025 · Fibromyalgia is a long-term condition that involves widespread body pain. The pain happens along with fatigue. It also can involve issues with sleep, memory and mood. …