Why Am I Sleeping So Much? Common Causes and What Can Help

If you're sleeping nine or ten hours and still dragging through the day, you might be asking, "Why am I sleeping so much?" Oversleeping can come from something as simple as catching up on lost sleep, or it can be a sign of a sleep disorder, a medical condition or depression. Figuring out the cause is the first step toward feeling rested again.

Key takeaways

• Most adults need about 7 to 9 hours of sleep. Regularly needing much more and still feeling tired can be a sign of a problem.
• Hypersomnia means feeling very sleepy during the day or needing too much sleep, even after a full night's rest.
• Common causes include sleep debt, shift work, sleep disorders, medical conditions, medications, depression and seasonal affective disorder.
• Steady sleep habits help, but lasting oversleeping deserves a medical and mental health evaluation.

What is hypersomnia?

Hypersomnia is the medical term for excessive sleepiness. People with hypersomnia may sleep a long time at night and still feel tired, or struggle to stay awake during the day. It can make it hard to keep up with work, school, relationships and daily routines.

Normal sleep vs. too much sleep

Sleep needs vary, but most adults do well with about 7 to 9 hours a night. Sleeping a bit longer now and then isn't a cause for concern. What matters more is the pattern:

• Do you regularly sleep 10 or more hours and still wake up tired?
• Do you fall asleep easily during the day, even after a full night?
• Is sleepiness affecting your focus, memory, mood or safety?

If you answered yes, it's worth looking into why.

Why am I sleeping so much? Everyday causes

Sometimes oversleeping is your body trying to catch up.

Sleep debt

When you don't get enough sleep for a while, your body builds up a "sleep debt." You may then sleep much longer on weekends or days off to make up for it. Irregular bedtimes, short nights and poor-quality sleep can all add to the debt.

Schedules and lifestyle

Night shifts, long work hours, caregiving and busy social lives can all cut into sleep. Shift workers in particular often struggle to keep a steady sleep pattern, which can leave them feeling very tired and sleeping long hours when they finally can.

Medical causes of excessive sleepiness

Several health issues can make you feel sleepy no matter how long you're in bed.

Sleep disorders

• Obstructive sleep apnea: breathing repeatedly stops and starts during sleep, which lowers sleep quality.
• Narcolepsy: a neurological disorder that affects how the brain controls sleep and wakefulness.
• Restless legs syndrome: uncomfortable urges to move your legs can disrupt sleep.

Other medical conditions

• Hypothyroidism: an underactive thyroid can cause fatigue and extra sleep.
• Diabetes: can contribute to fatigue and daytime tiredness.
• Chronic pain: can make it hard to fall or stay asleep, leaving you exhausted.

Medications

Some medications cause drowsiness as a side effect. If you think a medication is making you sleepy, talk with your prescriber before starting, stopping or changing anything. They may be able to adjust the timing or the medication itself. Our article on the best time to take psychiatric medication explains how timing can affect side effects.

Mental health reasons for oversleeping

Your mood and your sleep are closely connected.

Depression

Depression can change sleep in both directions. Some people can't sleep, while others sleep far more than usual and still feel drained. Oversleeping with depression often comes with low mood, loss of interest, low motivation and pulling away from others.

Anxiety

Anxiety can be exhausting. Some people sleep more as a way to escape stress or because worry leaves them worn out.

Seasonal affective disorder

Seasonal affective disorder (SAD) is a type of depression that returns at the same time each year, usually in fall and winter. Less sunlight can throw off your body's internal clock, and oversleeping is one of the most common SAD symptoms. Learn more in our guide to seasonal affective disorder treatment.

Stress and burnout

Long-term stress can disrupt your sleep, and burnout can leave you feeling deeply exhausted. Oversleeping can then make you feel even more sluggish, creating a cycle that's hard to break. Addressing the stress itself is part of getting your sleep back on track.

What you can do about excessive sleep

Build steadier sleep habits

Small changes can help reset your body clock:

• Go to bed and wake up at the same time every day, including weekends.
• Keep your bedroom dark, quiet and cool.
• Cut back on caffeine, especially later in the day.
• Put screens away before bed, since screen light can interfere with melatonin.

Know when to get help

If better habits don't help, or you notice any of the signs below, it's time to see a provider:

• You feel very tired most days, even after plenty of sleep.
• You have trouble focusing or remembering things.
• Sleepiness is affecting your work, relationships or safety, such as drowsy driving.
• Low mood, loss of interest or hopelessness comes with the extra sleep.

What treatment may involve

Treatment depends on the cause. A provider may recommend testing for a sleep disorder like sleep apnea or narcolepsy, which may mean a referral to a sleep specialist. Lab work can check for medical causes such as thyroid problems.

If depression, anxiety or SAD is part of the picture, treating it can improve your sleep, too. A psychiatric evaluation can sort out what's driving your symptoms, and integrative psychiatry looks at sleep, nutrition, labs and mood together. If medication is part of your plan, regular follow-up helps your provider adjust it over time.

If oversleeping comes with thoughts of hopelessness or suicide, call or text 988 right away, or visit our crisis resources page.

Frequently asked questions

How much sleep is too much?

Most adults need about 7 to 9 hours. Regularly needing 10 or more hours and still feeling tired can be a sign of an underlying issue. The pattern and how you feel during the day matter more than one long night.

Can depression make you sleep too much?

Yes. Depression can cause some people to sleep much more than usual and still feel exhausted. If oversleeping comes with low mood or loss of interest, it's worth getting a mental health evaluation.

Why am I sleeping so much and still tired?

Feeling tired after a long sleep can point to poor-quality sleep, such as from sleep apnea, or to a condition like hypothyroidism, depression or SAD. Some medications can also cause drowsiness. A provider can help find the cause.

Is sleeping too much bad for you?

Occasional long sleep after a tiring week is normal. But ongoing oversleeping can be a sign of a health problem and can leave you feeling more sluggish. If it lasts, talk with a provider.

Get to the root of your sleepiness

If you're sleeping more and still not feeling like yourself, our psychiatrist and psychiatric physician assistants can help look at the full picture, from mood to labs. We see patients in person in Chicago and by telehealth anywhere in Illinois. Request an appointment to get started.