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Sleep Disorders
Sleep plays an essential role in supporting both mental and physical health. However, sleep disorders such as insomnia, hypersomnia, and sleep apnea syndrome can cause a wide range of difficulties in daily life. Symptoms such as “being unable to sleep,” “difficulty waking up in the morning,” or “excessive daytime sleepiness” may be related not only to lifestyle habits, but also to overwork, interpersonal stress, disrupted daily rhythms, and underlying mental or physical illnesses.
On this page, we introduce research articles and commentaries on sleep disorders written by the clinic director over the years. Through the perspectives of sleep medicine and psychiatry, we aim to promote a deeper understanding of sleep-related problems.
Insomnia
Insomnia is a sleep disorder in which difficulty sleeping leads to impairment in daytime functioning. Symptoms vary and include difficulty falling asleep, frequent nighttime awakenings, and early morning awakening. It is often associated with stress, irregular lifestyle rhythms, mental health conditions, and physical illnesses, and may become chronic. In recent years, greater emphasis has been placed not only on improving sleep itself but also on addressing underlying lifestyle and psychological factors.

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Hypersomnia
Hypersomnia is a sleep disorder characterized by excessive daytime sleepiness and difficulty maintaining wakefulness. It includes conditions such as narcolepsy and idiopathic hypersomnia. Although it is often mistaken for simple sleep deprivation, in some cases it is caused by dysfunction in brain arousal systems, making specialized evaluation essential.

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Sleep Apnea Syndrome
Sleep apnea syndrome is a condition in which breathing repeatedly stops during sleep. It reduces sleep quality, causing excessive daytime sleepiness and fatigue, and is also associated with hypertension and cardiovascular disease. In recent years, its impact on cognitive function and mental health has also attracted attention.

Circadian Rhythm Sleep–Wake Disorders
Circadian rhythm sleep–wake disorders occur when the internal biological clock becomes misaligned with social schedules. They include delayed sleep–wake phase disorder and non-24-hour sleep–wake rhythm disorder. These conditions are not simply “night owl” habits; their symptoms vary depending on social factors, lifestyle rhythms, and neurophysiological mechanisms, requiring individualized diagnosis and treatment.


Parasomnias
Parasomnias are sleep disorders characterized by abnormal behaviors or experiences during sleep, including sleep talking, sleepwalking, night terrors, and REM sleep behavior disorder. Although patients are often unaware of these events, they can lead to injuries and other life problems, making proper evaluation essential. Advances in neurophysiological and psychiatric research have improved diagnostic and therapeutic accuracy.

Many people struggle with problems such as “being unable to fall asleep” or “still feeling tired even after sleeping.” In some cases, sleep difficulties cannot be explained by lifestyle habits alone.
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