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Many of us have probably experienced symptoms like "no matter how much I sleep, my head doesn't feel clear" or "I get sleepy during the day, which affects my work." Even if you get enough sleep, there are several reasons why you might feel sleepy during the day.
This article introduces the causes and solutions for those who feel sleepy no matter how much they sleep. It's important to take action early, as there may be an underlying illness or condition.
What Causes You to Feel Sleepy Even After Sleeping?
The causes of persistent sleepiness despite adequate sleep are varied, including insufficient sleep duration, poor sleep quality, mental and physical stress, alcohol consumption, and underlying medical conditions. These can be broadly categorized into the following four areas:
- Daily life issues
- Illnesses and medical conditions
- Effects of female hormones
- Seasonal changes
It's important to note that feeling sleepy during the day, no matter how much you sleep, could be more than just lack of sleep; it could indicate underlying conditions such as depression or hypothyroidism.
Let's delve deeper into each of these categories.
Impact of Daily Life Issues
Lack of sleep or a decline in sleep quality due to environmental factors can lead to strong daytime sleepiness, interfering with work and daily life. Furthermore, mental and physical stress can disrupt the autonomic nervous system, potentially causing sleep disorders.
Let's look at some specific factors.
Chronic Sleep Deprivation
The average sleep duration for Japanese people is short compared to global standards, with "6 to less than 7 hours" being the most common tendency for both men and women at approximately 53.7%, followed by "less than 6 hours" at approximately 37.9%.
However, although there are individual differences, the generally recommended sleep duration for adults is 6 to 9 hours, meaning many people are currently sleep-deprived. Furthermore, persistent sleep deprivation leads to a state called "sleep debt," causing symptoms such as difficulty waking up, strong daytime sleepiness, poor physical condition, and irritability.
A concern is that if sleep debt persists due to lack of sleep, daytime sleepiness can become the norm.
Sleep debt cannot be resolved by simply sleeping a lot for one day; it requires a long-term approach. Since sleep debt adversely affects mental and physical health, it is important to take measures early.
Decreased Sleep Quality
If the temperature, humidity, lighting, or ambient noise in the bedroom are not appropriate, you may not be able to get good quality sleep. For example, if the bedroom is too hot or too cold, it can disrupt your sleep rhythm and make it difficult to fall asleep. Additionally, bright lighting and outside noise can stimulate the brain and hinder stable sleep, so it's important to be careful.
Furthermore, if your bedding is poor, your body may not be able to rest sufficiently, and you may wake up still feeling tired, potentially leading to daytime sleepiness. Thus, the sleep environment is an important factor in getting good quality sleep.
Psychological Stress
Psychological stress refers to a state of mental tension, anxiety, and impatience caused by life events or environmental changes.
Psychological stress significantly affects the autonomic nervous system and can be a cause of sleep deprivation. Normally, at night, the parasympathetic nervous system becomes dominant, making it easier to fall asleep in a relaxed state. However, persistent stress can cause the sympathetic nervous system to become dominant.
When the sympathetic nervous system is dominant, the duration of non-REM sleep (deep sleep), which is crucial for brain recovery, decreases. This prevents sufficient rest, leading to sleepiness and decreased concentration the next day.
Alcohol, Caffeine, and Other Substance Intake
The use of substances such as alcohol, caffeine, and sleeping pills can affect sleep quality. Alcohol, in particular, may initially induce sleep, but it subsequently degrades sleep quality and can lead to daytime sleepiness. Therefore, if you drink alcohol before bed to help you sleep, be aware that it might actually make it harder to sleep.
Caffeine has a stimulating effect, so consuming it before bed can interfere with falling asleep and reduce sleep quality. Additionally, some medications, such as anti-allergy drugs, can have drowsiness as a side effect and affect sleep quality.
Furthermore, low blood sugar can also cause persistent sleepiness. For more details, please see below:
Still Sleepy After Sleeping? The Cause Could Be Low Blood Sugar!
Impact of Illnesses and Medical Conditions
If you're sleepy no matter how much you sleep, it might not just be lack of sleep but rather hypersomnia. It's also possible that physical or mental illnesses are playing a role, so it's important not to dismiss it as mere sleep deprivation.
Hypersomnia
Hypersomnia is characterized by not experiencing symptoms like breathing cessation during sleep (sleep apnea) and, despite long hours of nighttime sleep, experiencing strong daytime sleepiness and a lack of feeling refreshed.
There are three main types of hypersomnia: narcolepsy, idiopathic hypersomnia, and recurrent hypersomnia. Let's look at the different symptoms of each.
Narcolepsy
Narcolepsy is a sleep disorder primarily characterized by severe daytime sleepiness and sudden sleep attacks. Patients with narcolepsy may experience "cataplexy," a sudden loss of muscle tone triggered by strong emotions such as laughter, anger, or sadness.
They may also experience "hypnagogic hallucinations," vivid hallucinations upon falling asleep, and "sleep paralysis," temporary inability to move upon waking.
For more information about narcolepsy, please refer to the article below.
What is Narcolepsy? Causes, Symptoms, and Characteristics of Those Affected
Idiopathic Hypersomnia
Idiopathic hypersomnia is characterized by not waking up for more than an hour after a nap and not feeling refreshed even after waking up.
It primarily affects people in their teens and twenties, who experience daytime sleepiness and frequent napping almost daily. The cause is unknown, but it is believed to be related to autoimmune reactions and genetic factors.
Recurrent Hypersomnia
Recurrent hypersomnia is characterized by episodes of severe sleepiness lasting three days to three weeks, recurring at intervals of several weeks to several months. During these hypersomnia episodes, individuals may sleep 16 to 20 hours a day, regardless of day or night.
It is a very rare disease, estimated to affect 1 to 2 people per million.
Physical Illnesses
The following physical conditions can be a cause:
- Allergic diseases such as hay fever and allergic rhinitis
- Sleep apnea syndrome
- Restless legs syndrome
- Neurological disorders such as cerebrovascular diseases (cerebral infarction, cerebral hemorrhage, etc.) and brain tumors
- Endocrine disorders such as hypothyroidism
- Circadian rhythm sleep-wake disorders such as jet lag
These conditions can cause hypersomnia, so if recurrent hypersomnia is observed, examination by a specialist is important. Appropriate treatment can be expected to improve hypersomnia symptoms.
Mental Illnesses
Mental illnesses such as depression and bipolar disorder are known to significantly affect sleep quality and quantity. In depression, insomnia symptoms often coexist, including difficulty falling asleep and waking up during the night.
Sleep plays a role in recovering from mental and physical fatigue, but when sleep is disrupted by depression, hypersomnia can occur.
Impact of Female Hormones
The state of feeling sleepy no matter how much you sleep is also known to be closely related to fluctuations in female hormones. As one of the symptoms of premenstrual syndrome (PMS), strong daytime sleepiness or hypersomnia may appear. This is because the fluctuations in estrogen and progesterone during the menstrual cycle affect the autonomic nervous system, leading to disturbances in sleep and wakefulness rhythms.
Especially in the premenstrual period, a decrease in progesterone can intensify sleepiness, making hypersomnia more likely to occur.
Impact of Seasonal Changes
Beyond certain illnesses or hormonal imbalances, seasonal factors such as temperature differences and changes in daylight hours can also be closely related. In particular, reduced daylight hours during winter tend to delay melatonin secretion and can induce depressive states. In spring, however, in addition to lifestyle changes, hay fever can also be a contributing factor to feeling sleepy.
It is also known that physical illnesses such as seasonal affective disorder can affect the onset of hypersomnia. Seasonal affective disorder is characterized by atypical symptoms such as hypersomnia and overeating, which are thought to be caused by disruptions in the sleep-wake rhythm.
Daily Actions You Can Take
Here are some self-improvement methods you can try. Incorporate them into your routine as much as possible.
Regular Daily Routine
To avoid feeling sleepy during the day, it is important to establish a regular daily routine by correcting your lifestyle habits. First, maintain a consistent bedtime and wake-up time. Even on holidays, try to go to bed and wake up at roughly the same time.Furthermore, increasing your daily activity level and engaging in moderate exercise can lead to better quality sleep. Additionally, eating meals at regular times helps to regulate your internal clock. It is also important to get sunlight in the morning.
During the day, light stimulation suppresses melatonin secretion, maintaining a state of wakefulness. However, 14 to 16 hours after waking up in the morning, melatonin secretion restarts due to signals from the internal clock.
Good quality sleep means that the light received in the morning helps secrete melatonin at night, promoting natural sleep.
Improve Your Sleep Environment
To achieve good quality sleep, it is crucial to optimize your bedroom environment. The acceptable indoor temperature is said to be between 13°C and 29°C, and a temperature around 33°C inside the bedding is generally considered fine. Adjust with bedding and sleepwear.
Also, before going to bed, it's important to create a quiet environment with dim lighting and avoid exposure to blue light. Blue light can disrupt your internal clock, so finish using smartphones and computers at least 30 minutes before bedtime.
By optimizing the bedroom temperature, humidity, bedding, light, and sound, you can create a more comfortable sleep environment.
Consult a Doctor if Necessary
If symptoms do not improve despite reviewing your lifestyle habits and sleep environment, it is recommended to consult a medical professional.
While psychiatric and psychosomatic clinics typically treat sleep disorders, if the problem is related to conditions such as sleep apnea syndrome or restless legs syndrome, it is appropriate to be examined by a sleep specialist. Visiting a hospital with a sleep specialist will allow for more specialized diagnosis and treatment.
If insomnia symptoms persist or are severe, it is important to consult a doctor at a medical institution as soon as possible.
Recommended Sleep-Enhancing Products for When You're Still Sleepy After Sleeping
If you often feel sleepy even after sleeping, start by reviewing your daily bedding. Brain Sleep offers a variety of bedding products designed to promote comfortable sleep. Their mattress, in particular, excels in pressure distribution, replicating the neutral posture advocated by NASA. It boasts excellent breathability, ensuring comfortable sleep without stuffiness even after long hours of use.
Additionally, Brain Sleep's pillow is made of over 90% air, which helps cool the brain and promote quick, deep sleep even on hot days. They also offer a range of bedding, including comforters (duvets) suitable for different seasons.
For more details on Brain Sleep products, please visit the following page:
Improve Your Persistent Sleepiness by Addressing Your Sleep
The main causes of daytime sleepiness and fatigue are varied, including insufficient sleep, sleep environment issues, irregular lifestyle habits, stress, and hormonal fluctuations. Make an effort to ensure adequate sleep duration, maintain a good sleep environment, keep a regular daily rhythm, manage stress, and eat a balanced diet. However, if sleepiness persists, it is recommended to consult a doctor.
By utilizing Brain Sleep's bedding, you can achieve high-quality sleep and enjoy healthy days with less fatigue. Start by improving your sleep quality.
