Why Do I Sleep So Much? 9 Likely Reasons

There are various reasons that may cause a person to oversleep and these can stem from physical, mental and even emotional causes. 

The most important factor in determining if oversleeping is due to medical problems is the associated symptoms. In this article, we are going to discuss various reasons why you may be sleeping so much.

How Many Hours Should I Sleep For?

Sleep is a naturally recurring state of rest for the mind and body where consciousness is completely or partially lost. It is a time where your body ‘closes business’ for the day and allows your brain to sort and store information that it has received. This is why sleep is vital for you to function optimally in your day-to-day activities.


The number of hours of sleep you need daily is dependent on your age, the National Sleep Foundation recommends 7-9 hours per day for adults.

Oversleeping, in an adult, is sleeping longer than 9 hours while under-sleeping in the same age bracket is sleeping less than 7 hours per day.

What Causes Oversleeping?

Below are some of the causes of too much sleep, if you have symptoms, it is still advised that you see your doctor.

1. Stimulants
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Alcohol and caffeine fall into this category.

Research has shown that taking alcohol or caffeinated drinks a few hours before sleep causes you to oversleep. This happens because these drinks affect your sleep cycle causing you to sleep poorly and then your body lengthens the time you need to sleep so that it can refresh itself.


If you are in the habit of taking more than a few glasses of wine with your dinner or taking a few cups of coffee before bed, this might be the reason you sleep too much.

2. Medication

Some prescription drugs are commonly known to cause drowsiness. Some examples are:

  • narcotics like Morphine
  • anti-depressants like Tryptizol
  • blood pressure drugs especially beta-blockers like Inderal
  • anti-nausea and vomiting drugs like promethazine
  •  antiepileptics like Tegretol and Dilantin.

Anticancer drugs also cause fatigue and sleepiness. If you are on prescription drugs and you have been sleeping too much, check the label for the side effects of the drug. If it says ‘may cause drowsiness’ then that may be your culprit. However, do not stop a prescription drug until you have spoken with your doctor.

3. Overwork

The first thing you should do when assessing yourself for oversleeping is if you are oversleeping just because you like to sleep.

The second is to assess if you are overworking your body. Pulling an all-nighter to turn in a project for work or study will overwork your body. Working shifts day and night and sleeping only two to three hours in between will overwork your body.


Working all week and partying all weekend will overwork your body. Doing anything that requires a lot of energy and cutting short your sleep hours is overworking your body. Your body’s natural response is to catch-up on its much-needed sleep.

If you notice you have been oversleeping and you realize that you have over-worked your body, it may be that your body is trying to regain its depleted energy.

The above are some of the non-medical causes of oversleeping. Although any one of them may be the sole cause of your oversleeping, it is also possible that their effects coincide with medical causes.

4. Hypersomnia

Hypersomnia is the medical term for sleeping too much due to an illness. It can be primary, meaning that it occurs on its own or secondary, meaning that it occurs due to the presence of another illness.

Primary hypersomnia is a sleep disorder that causes people to sleep for unusually long periods of time (more than ten hours) as well as sleepiness throughout the day which is not relieved by napping.

Other symptoms of hypersomnia include memory problems, decreased concentration, and anxiety. Primary hypersomnia is a relatively uncommon illness, occurring in less than 1% of the population.

5. Narcolepsy

Narcolepsy is a sleep disorder with symptoms of excessive sleepiness, sleep paralysis, hallucinations (especially when falling asleep or waking up).

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People who have narcolepsy sometimes have sleep attacks, falling asleep in unlikely places and situations. Narcolepsy is a condition that has to be managed by a sleep specialist as there is currently no cure, but medications and behavioral therapy are used to help control symptoms allowing those with the condition to live normal lives.

6. Obstructive Sleep Apnea

When sleeping a lot occurs with really loud snoring, daytime tiredness, headaches, restlessness during sleep, waking up feeling like you are choking and your sleep partner complaining that you hit them in the middle of the night – there may be obstructive sleep apnea.

This happens when your throat muscles relax and the tongue blocks the airway preventing adequate airflow in and out of your lungs. There may be repeated episodes where a person stops breathing (apnea) and then forcefully resumes with a gasp or snort but you are unaware because you are asleep.

Sleeping on your side may reduce the symptoms. It is usually associated with obesity, so weight loss may also be beneficial. This condition is potentially serious and needs medical attention as soon as possible because the effects include decreased oxygen flow to vital organs and irregular heart rhythm.

7. Clinical Depression

Depression is one of the numerous mental health conditions that have been well studied and the treatment options available are pretty good.

In clinically depressed people, there are chemical imbalances in the brain which is what the approved medications aim to correct. The symptoms are easy to spot especially when there is a loss of interest in the things one previously enjoyed.

Other signs of depression are sleep changes (increased daytime sleep or decreased nighttime sleep), change in appetite, loss of concentration, feelings of worthlessness or guilt, a lack of energy, anxiety or suicidal thoughts. If you have some or most of these symptoms, please contact your doctor.

If you have suicidal thoughts please speak with your doctor immediately or go to the emergency room.

8. Hypothyroidism

The thyroid is a small but very important organ located in the front aspect of the neck. It usually cannot be felt unless it is enlarged.

The thyroid produces hormones that determine the rate at which your body system works. When these hormones are produced in lower quantities, hypothyroidism is the result. In hypothyroidism, the body is slower- making you feel more tired with decreased concentration, weight gain, sleep changes (usually increased sleep), cold intolerance and dry skin.

In women, there may be menstrual changes. Hypothyroidism is a very common and highly manageable condition; however, prompt treatment produces better results.

9. Infections

Most infections cause tiredness and sleepiness. This is because of the body’s natural response of shutting down other operations to focus on the fight between the invaders (the germs) and your body’s army (the white blood cells).

An infection usually comes with other symptoms like a high body temperature (fever) and pain in the affected part; unless you are suffering from the flu, then you could have pain all over. No matter the affected body part, it’s perfectly natural for you to sleep extra hours.

This is also true when you are recovering from an illness, the repair process your body goes through needs a lot of energy, so you may feel spent and extra tired.

Can Sleeping Too Much Affect Me?

The truth is that too much sleep can be bad for you. Multiple studies have been done on sleep habits and some adverse effects due to sleeping too much have been noted. Some of the effects include:

  • Diabetes mellitus
  • Heart disease especially coronary artery disease
  • Headaches
  • Obesity
  • Depression

Multiple studies have proved that people who regularly sleep more than nine hours a night have significantly higher death rates than those who sleep seven to eight hours a night.

What To Do Next

  • If it’s just a love for sleep, try to get up from the bed once you are awake. There’s a high likelihood of you falling back asleep if you remain on the bed.
  • You could also set an alarm to wake you up. Ensure you get the kind that wakes you up gradually and not those that jar you awake, studies have shown that gradual alarms are better for your health.
  • If you are being treated for an illness (or you are recovering), you may not need further investigation. Allow your body fully repair itself and in a few days to weeks your body should revert back to its usual state, depending on what illness you are recuperating from. If you feel like your recovery is taking too long or you still feel as bad as before, do not hesitate to contact your doctor.
  • If you have overworked yourself, your body should reset itself in 2-3 days. Try not to get to the point where you overwork yourself especially if it can be avoided. Constantly overworking yourself increases your stress levels and increased stress has been linked to developing diabetes and hypertension.
  • If you are on medication that has the side effect of drowsiness, please do not stop them until you have spoken with your doctor. It is possible to request for drugs that do not cause drowsiness. Changing prescription drugs have to be done while being monitored by your physician because your doctor knows what drugs are best for your specific needs.
  • If you notice you are oversleeping and have other symptoms similar to those previously explained or even extremely different from some of the examples above, please see your doctor. It is always better to go to your doctor when you are not sure what is going on because you may have a serious illness.
  • It may also be helpful to keep a sleep diary before your appointment so your doctor has a better picture of your sleep patterns.


Maintaining good sleep hygiene is beneficial for everyone regardless of the cause of your oversleeping. Good sleep hygiene is the variety of habits that you do to ensure good quality nighttime sleep resulting in full daytime alertness. Some excellent tips are:

  • Establishing a regular relaxing nighttime bedtime routine including going to bed and waking up at the same time every day (+/- 20 minutes).
  • Limiting daytime naps to 30 minutes.
  • Avoiding stimulants like alcohol, caffeine, and nicotine close to bedtime
  • Avoiding heavy, fatty or spicy meals just before bedtime.
  • Sleep on a comfortable bed in a dark, quiet and cool room.
  • Avoid rigorous exercise just before bedtime as this will stimulate you and keep you from sleeping.
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