Most people know that skimping on sleep can be bad for you. Regularly getting too little sleep is linked to a number of chronic diseases, not to mention irritability and sluggishness during the day. 

But did you know that sleeping too much could also be problematic? Oversleeping is associated with many health problems, including:

• Type 2 diabetes
• Heart disease
• Obesity
• Depression
• Headaches
• Greater risk of dying from a medical condition

Does that mean sleeping too much will make you sick? Not necessarily, says Charlene Gamaldo, M.D., a neurologist and sleep specialist at Johns Hopkins Medicine. “We don’t exactly know the cause and effect,” she says. “It probably works the other way, that when you are sick, it leads to more sleep time.”

Does sleeping too much actually contribute to illness, or is it a sign of an existing condition? Either way, if you find yourself always nodding off or looking for the next nap, it might be time todiscuss the issue with your health care provider.

How Much Sleep Is Too Much?

Sleep needs can vary from person to person, but in general, experts recommend that healthy adults get an average of 7 to 9 hours per night of shuteye.

If you regularly need more than 8 or 9 hours of sleep per night to feel rested, it might be a sign of an sleep or medical problem, Gamaldo says.

What’s Making You So Tired?

A number of conditions can disrupt sleep or interfere with the quality of your slumber, leading you to feel tired and sluggish even after spending 8 hours in bed, says Gamaldo. Those conditions include:

• Sleep apnea, a breathing disorder that causes brief pauses in breathing during sleep
• Restless legs syndrome, a brain disorder that causes an unpleasant and sometimes overwhelming urge to move your legs when you’re at rest
• Bruxism, in which you grind or clench your teeth during sleep
• Chronic pain
• Certain medications

Then there are conditions that don’t significantly impair the quality of your sleep, but increase the amount of sleep you need. Those include:

• Delayed sleep phase syndrome, a disorder in which your circadian rhythm, or biological clock, keeps you up into the wee hours, making it hard to wake in the morning
• Idiopathic hypersomnia, a disorder that causes excessive sleepiness for unknown reasons

Fortunately, there are treatments for many of these conditions, which can help improve the quality of your sleep.

Having a Sleep Study

Many people find themselves sleeping more as they get older, and assume it’s a normal part of aging, Gamaldo adds. But getting older shouldn’t change your sleep needs dramatically. Most adults consistently need the same amount of sleep throughout their adult years.

If you’ve ruled out those conditions and are still hitting the snooze button after 9 hours under the covers, it might be a clue that you have an underlying medical condition such as heart disease, diabetes or depression.

If you’re an oversleeper, Gamaldo recommends checking in with your health care provider. He or she might recommend a sleep study to rule out sleep disorders. “If possible, you should seek professional help from a sleep center,” she says.