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Scientific research shows that sleep is essential at any age. It restores the body, sharpens the mind, and strengthens almost all body systems.
However, some people experience constant sleepiness. Why does this happen, and what can you do about it? Sleep Foundation explains.
Common Causes of Excessive Sleepiness
Most often, persistent drowsiness is caused by:
Fatigue and stress
Chronic health conditions
Certain medications, such as antidepressants
A healthy adult typically needs 7–9 hours of sleep per night. Sleeping too little or too much can be harmful. Oversleeping may increase the risk of heart disease, type 2 diabetes, depression, and obesity.
Recommended Sleep Duration by Age
Scientists have established guidelines for how long people should sleep depending on age. In some cases, sleeping an hour more or less than the recommended range may be acceptable depending on circumstances.
Psychological and Physical Factors
Psychological causes include:
Stress
Depression
Anxiety
Physical causes include:
Iron-deficiency anemia
Low thyroid activity
Sleep apnea
Side effects of medications or some supplements
Lifestyle habits can also make you feel constantly sleepy:
Excessive alcohol or caffeine consumption
Night shifts or irregular work schedules
Less Common Medical Causes
Some conditions increase sleepiness even when sleep quality is good:
Narcolepsy – a brain disorder that disrupts normal sleep-wake cycles
Delayed sleep phase syndrome – a circadian rhythm disorder making it difficult to wake up early
Idiopathic hypersomnia – excessive sleepiness with no known cause
When to See a Doctor
If sleepiness persists despite adequate rest, specialists recommend consulting a doctor. They can determine the underlying cause and suggest appropriate treatment.
