Suddenly Sleeping Too Much? 6 Causes You Should Know

Suddenly sleeping too much and feeling drowsy all day? You’re not alone. This sudden change could be your body’s way of signaling stress, sleep deprivation, or even a hidden health issue. In this article, we’ll break down what could be causing it and when you should be concerned.

Sleep is a natural phenomenon that signals the body’s need to shut down physical and mental activities. It is a refreshing experience that normally comes every night, and scientists have shown that it helps to restore normal body balance after a period of stress and physical activity.

But while the benefits of sleep are endless, there comes a time when one begins to feel that one is sleeping too much. This occurs when sleep disrupts one’s daily activities, plans, or even meetings with other people in social or professional settings. In these cases, it becomes important to understand the real reasons why you are sleeping too much and what you can do about it.

In this post, I will be discussing some common reasons you are suddenly sleeping too much and how you can find a solution to it. But first, what is the normal daily duration for sleeping?

How Much Sleep Do You Need?

In order to understand when we can say we are oversleeping, we need to consider how much sleep we generally need per day. You may be sleeping too much or having hypersomnia if you suddenly need to sleep longer than what is considered adequate per night.

Also, every time you say that you are suddenly sleeping too much, this is usually in reference to what your daily sleep duration has been. This means that the normal daily sleep duration differs for every individual. Daily sleep requirement also differs by age, with adults requiring less amount of sleep daily, and children and babies, more.^[1]How Sleep Works – How Much Sleep Is Enough? | NHLBI, NIH

Table showing recommended hours of sleep per day for people of all age groups.

Sleep experts have recommended that healthy adults get an average of 7 to 9 hours of sleep every night.^[2]Oversleeping: Bad for Your Health? | Johns Hopkins Medicine However, some adults might be okay with as little as 6 hours of sleep per night.

Thus, you might be oversleeping if you suddenly need to sleep longer than 9 hours per day, if you are sleeping longer than you used to, or if sleep is disrupting your daily activities despite how much you slept the previous night.

6 Reasons You’re Suddenly Sleeping Too Much

Interestingly, not every time you sleep too much means a bad thing. There are normal physiological reasons why your body might require more hours of sleep. However, there are also health-related reasons why sleeping too much is a concern.

If you suddenly start sleeping too much, here are some possible reasons and what you can do to correct your sleep cycle or sleep duration.

1. Extreme tiredness or accumulated stress

Stress and tiredness are some of the commonest reasons you might suddenly be sleeping too much lately. You might be involved in a lot of physical or mental activity with little or no time for rest or getting adequate sleep. After this period, your body might start to compensate for the stress and tiredness that have accumulated over time.

During sleep, the breathing cycle becomes regulated solely by the respiratory centres to deliver more oxygen to the lungs and tissues, the body’s glycogen and ATP stores are rebuilt, the brain creates new connections between recent and distant memories, etc. The resultant effect is the restoration of physical and mental energy, improved memory (formation of permanent memory), amongst other growth and health-related benefits.^[3]Harvard Health Publishing. “How Sleep Boosts Your Energy.” Harvard Health, 15 Feb. 2025, https://www.health.harvard.edu/healthbeat/how-sleep-boosts-your-energy

Thus, it is normal for the body to want to shut down for longer periods after a period of stress, physical or mental activity.

2. Sleep deprivation

In addition to stress and tiredness, sleep deprivation can also cause sudden excessive sleepiness. When you have exam schedules drawing closer, or loads of work to accomplish, you may be pressured to skip some hours of sleep just to achieve your targets. This can make you feel sleep deprived and can cause excessive daytime sleepiness.

Some people might take it a step further by using medications to keep them awake longer, or try interventions that help them avoid sleep for a few more hours. At the end of this period, it is natural for the body to try to get more sleep to compensate for those periods of apparent sleep deprivation, and this is yet another common reason why people experience sudden excessive daytime sleepiness.

3. Sleep disorders

Sleep disorders are other reasons why you may suddenly start sleeping too much. These are disorders that increase the body’s need for sleep, and include narcolepsy, sleep apnea, or a period of insomnia (or lack of sleep).

Narcolepsy is a condition where the mechanism that separates wakefulness from sleep becomes unstable. This is primarily due to an imbalance of the sleep-regulating neurotransmitter, hypocretin (orexin). Orexin stimulates the reticular activating system (RAS), which mediates wakefulness, but this neurotransmitter decreases during sleep, leading to a depression of the RAS and causing sleep.

In narcolepsy, the above mechanism becomes unstable with insufficient levels of orexin, causing intrusion of sleep into wakefulness, characterized by episodes of daytime somnolence, cataplexy, and occasional hallucinations during the day.^[4]Brinkman JE, Reddy V, Sharma S. Physiology of Sleep. [Updated 2023 Apr 3]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: … Continue reading While there is no specific cure for narcolepsy, treatments are aimed at enhancing wakefulness through medications and lifestyle modification.

In sleep apnea, there is a temporary cessation of breathing during sleep, which can affect the quality of sleep one gets per day. As a result, not getting enough sleep can predispose one to sleeping too much during the day and at other times.

4. Depression/Seasonal Affective Disorder (SAD)

Mental health conditions like depression and seasonal affective disorder. Seasonal affective disorder (SAD) is a type of depression that follows seasonal patterns, occurring most often during fall or winter (also known as “winter depression”). SAD and depression are characterized by feelings of sadness, lack of energy, loss of interest in previously pleasurable activities, oversleeping, and weight gain.^[5]Johns Hopkins Medicine. “Seasonal Affective Disorder.” Accessed May 20, 2025. https://www.hopkinsmedicine.org/health/conditions-and-diseases/seasonal-affective-disorder

Sleeping too much recently may be a sign of new-onset depression or seasonal affective disorder. This diagnosis can be suspected if you find other associated signs, including lack of energy, loss of interest in previously pleasurable activities, weight gain, etc., and you might need to see a doctor for proper treatment.

5. Underlying medical illness

The presence of other underlying medical conditions can also predispose to oversleeping. These include diabetes, heart disease, obesity, hypothyroidism, obesity, and febrile illness or infections.

These medical illnesses alter the body’s homeostasis or balance in ways that can also affect the sleep cycle. They increase the body’s metabolic rate, which creates a state of metabolic stress and predisposes to excessive sleeping.

A rare tropical illness called sleeping sickness can also cause sudden, excessive daytime sleepiness. This is usually caused by the bite of the African Tsetse fly.

6. Medications

Certain medications can make you sleep more than usual. If you are on any medications, they could be the reason why you are suddenly sleeping too much lately.

Antihistamines, antipsychotic medications, tranquilizers, and sleep medications are examples of medications that can cause excessive daytime sleepiness. While some of these medications are taken primarily for their sleep-inducing properties, some, like antihistamines, cause sleepiness as an unintentional effect (what is known as side effects).

If the time you observed excessive daytime sleepiness coincides with when you started taking a new medication, it could be what is causing it. You should discontinue the medication temporarily or consult with your doctor for expert advice on what might be causing your excessive sleepiness.

When You Need to See a Doctor

Not every cause of oversleepiness requires one to see a doctor. Knowing that you are sleeping too much because you have not had enough sleep in the past few days naturally demands that you should prioritize getting adequate sleep first. If you identified stress and tiredness as the culprits for your too much sleep, getting rest and sleep may be the best thing to do.

However, certain conditions may require you to see a doctor when you are struggling to keep awake. These include medication conditions discussed above, mental health conditions like depression or seasonal affective disorder, as well as sleep disorders like narcolepsy. Your doctor will be able to help you find the root cause of your oversleepiness and offer you helpful solutions.

It might also be helpful to see a doctor when sleeping too much starts interfering with your daily activities, work, and productivity.

Frequently Asked Questions

Final words

Suddenly sleeping too much could mean one of many things, including normal experiences like stress or tiredness, or more serious conditions that might require you to see a doctor.

For the mild situations, getting adequate sleep might be the solution to your sleepiness. You don’t have to deprive your body of the much-needed sleep much longer before this begins to cause more serious problems for you and your health.

Sleep is not a crime. You should prioritize getting adequate daily sleep, but when it becomes too much or when it starts affecting other areas of your life, it might be a thing of concern. Are you struggling with sleep yourself? Let me know what you think the problem might be. I may be able to help you further.