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If you often feel very tired during the day, you may simply not be getting enough sleep at night. But you may have a medical condition that causes daytime sleepiness, such as obstructive sleep apnea, narcolepsy, or fibromyalgia.

Does your mind race when your head hits the pillow? Or you just can't relax enough for your body to fall asleep? Learn about underlying causes of insomnia and how to help them.

Sleeping with your mouth open can actually impact your health and wellbeing. Learn what mouth breathing is, what causes it, and how to learn to breathe through the nose at night instead.

There are many reasons you're feeling tired all day. Maybe you're not going to sleep too late, or you have insomnia. Or it may be a hormonal or mental health issue. It's important to find the cause and try to treat it.

Exhaustion can be from poor sleep, chronic pain, thyroid issues, or obstructive sleep apnea. Here’s how to tell what’s causing your fatigue and how to treat it.

Why do you feel so tired and sleepy? A comprehensive guide to causes of excessive daytime sleepiness