In Ancient Greece sleep was a distinctive healing practice associated with Asclepius, the Greek god of medicine, and the tradition of enkoimesis (ἐγκοίμησις), or therapeutic sleep incubation. This healing practice was performed in sacred healing centers, known as Asclepieia, visited by patients seeking relief from physical ailments, psychological distress, and illnesses that conventional remedies had failed to resolve.
Sleep in these places was also a potential way to communicate with the divine, gain psychological reassurance, and receive therapeutic intervention. Within this tradition, therapeutic sleep incubation was a significant healing practice that was popular in Ancient Greece.
The 2025 article by Kapotsis G, Steiropoulos P, Rovina N, Vagiakis E, Trakada G. Sleep incubation [enkoimesis] in medical practice at Asclepieia of ancient Greece – The ancient Greek sleep medicine (Sleep Medicine. 2025;130:31–35) explores the historical significance of this practice and its possible connections with contemporary medical concepts. The authors emphasize its holistic character, its relationship with the placebo effect, and its contribution to the historical transition from religious healing toward empirical medicine.
Although ancient incubation cannot be equated with modern sleep therapy, its underlying recognition that sleep, psychological expectation, the therapeutic environment, and the relationship between patient and healer influence recovery remains remarkably relevant. Examining this tradition therefore offers valuable historical perspective on modern medicine, particularly sleep medicine, psychosomatic care, patient-centered treatment, and the therapeutic importance of hope.
Historical foundation of therapeutic incubation
The Asclepieia were among the most influential healing institutions of ancient Greece. The sanctuary of Epidaurus became particularly renowned, attracting patients from different regions of the Greek world. Other important centers existed at Pergamum, Athens, and Corinth. These sanctuaries combined religious devotion with therapeutic activities, creating environments in which physical treatment, psychological preparation, and spiritual experience were closely interconnected.
The healing process generally involved several stages. Patients underwent purification, which could include bathing, fasting, exercise, prayer, and sacrifices. They might also participate in communal activities and observe inscriptions describing previous successful cures. These preparations established an atmosphere of anticipation and confidence before the central therapeutic ritual.
The final stage was enkoimesis. Patients entered a specially designated sleeping area called the abaton or enkoimeterion, where they spent the night awaiting a healing dream or divine appearance. According to ancient descriptions, the god Asclepius might appear and provide instructions, prescribe remedies, diagnose an illness, or perform a miraculous cure.
Historian Pausanias describes the ritual as involving sacrifice and sleeping upon the skin of a sacrificial animal. The sanctuary therefore represented a structured therapeutic environment rather than simply a place where patients independently sought supernatural assistance.
The experience was profoundly personal. Patients entered the sanctuary with their own symptoms, fears, expectations, and hopes. The dream, interpreted within the religious framework of the sanctuary, offered an explanation of their suffering and a possible pathway toward recovery.
Dreams and the healing experience
Ancient Greek medicine developed within a cultural environment in which dreams were regarded as potentially meaningful. The gods associated with sleep and dreams, particularly Hypnos and the Oneiroi, occupied an important position in mythology and religious imagination.
Nevertheless, the relationship between sleep and medicine was not exclusively religious. Greek thinkers increasingly explored sleep as a natural phenomenon and investigated its relationship with bodily functions.
Hippocrates emphasized observation and the natural causes of disease, contributing to the development of medicine as an empirical discipline. Aristotle examined sleep, waking, dreams, and their relationship with physiological processes in several philosophical works. These investigations helped establish sleep as a subject of intellectual and medical inquiry.
The 2025 paper highlights this historical transition, arguing that incubation contributed to the evolution of medicine by bringing together therapeutic experience, individual observation, and the patient’s subjective understanding of illness.
However, the ancient practice should not be interpreted as an early version of modern sleep laboratories or evidence-based sleep therapy. Its significance lies primarily in its recognition that healing involves more than the direct treatment of physical symptoms. Sleep was simultaneously a physiological condition, a psychological experience, and a culturally meaningful therapeutic event.
The holistic approach
One of the most important connections between ancient incubation healing and modern healthcare is the holistic understanding of the patient. The Asclepieia addressed patients within a comprehensive environment that included physical activity, nutrition, purification, rest, social interaction, and psychological reassurance. Treatment was not limited to administering a remedy.
Patients were encouraged to participate in their healing experience. Their symptoms were acknowledged, their expectations were shaped, and their experiences were interpreted within a framework that gave meaning to illness.
This approach resembles contemporary patient-centered medicine, which recognizes that effective healthcare requires attention to physical, psychological, social, and emotional dimensions. Modern clinical practice increasingly emphasizes shared decision-making, therapeutic communication, individualized treatment plans, and the patient’s participation in recovery.
The historical comparison is particularly relevant to chronic illnesses, where symptoms may persist despite appropriate medical treatment and where psychological distress can significantly affect quality of life.
For example, patients experiencing chronic pain, functional disorders, or long-term sleep disturbances may benefit from treatment approaches that combine medical intervention with psychological support and lifestyle modification. Medicine becomes more effective when patients are treated as individuals rather than as collections of symptoms.
The placebo effect
A particularly important aspect of the 2025 article is its examination of incubation in relation to the placebo effect. The placebo effect refers to beneficial changes in symptoms or subjective experience that arise partly from treatment expectations, the therapeutic context, and the patient’s interaction with healthcare professionals. It does not mean that an illness is imaginary or that symptoms are voluntarily produced.
At the Asclepieia, several elements could have contributed to therapeutic expectations.
First, patients entered a sanctuary widely associated with healing. The reputation of Asclepius and the testimonies of previous patients could strengthen their belief that recovery was possible.
Second, the ritual itself created anticipation. Purification, sacrifice, and preparation for incubation established a meaningful sequence leading toward the expected healing experience.
Third, the sanctuary provided a setting in which patients could temporarily distance themselves from ordinary responsibilities and concentrate on their recovery.
These circumstances may have influenced anxiety, perceived pain, emotional distress, and the interpretation of bodily sensations.
Modern research recognizes that expectations and the therapeutic relationship can influence symptom perception and certain physiological responses. Placebo-related mechanisms have been investigated particularly in pain, nausea, and other subjective symptoms.
The ancient experience therefore offers a historical illustration of how the context of treatment can become part of its therapeutic effect. Nevertheless, placebo responses must not be confused with the elimination of underlying disease. They cannot replace effective treatment for infections, cancer, cardiovascular disorders, or other conditions requiring specific medical intervention.
The modern clinical objective is to understand and ethically incorporate beneficial contextual effects while maintaining scientific standards and avoiding misleading claims.
Sleep medicine
The relationship between Asclepius’ method of incubation and contemporary sleep medicine is especially significant. Modern medicine recognizes sleep as an essential biological process involved in cognitive functioning, emotional regulation, metabolic balance, immune activity, and physiological recovery.
Insufficient or disrupted sleep is associated with numerous adverse health outcomes. Sleep disorders, including insomnia, obstructive sleep apnea, and circadian rhythm disturbances, require appropriate diagnosis and treatment.
Unlike ancient incubation, contemporary sleep medicine investigates these conditions using physiological measurements, clinical assessment, and evidence-based interventions. Nevertheless, the ancient emphasis on sleep as an important component of recovery provides an interesting historical parallel.
The Asclepieia recognized the therapeutic value of rest and created environments in which patients could withdraw from everyday disturbances. Modern healthcare similarly acknowledges the importance of sleep quality, hospital environments, and the management of factors that interfere with recovery.
In hospitals, sleep may be disrupted by noise, lighting, frequent examinations, pain, anxiety, and unfamiliar surroundings. Improving sleep hygiene and reducing unnecessary nighttime disturbances can therefore contribute to better patient experiences.
The ancient practice also raises an important question: how can healthcare environments support the patient’s psychological readiness for sleep? Modern approaches include relaxation techniques, cognitive behavioral therapy for insomnia (CBT-I), appropriate environmental adjustments, and individualized treatment of underlying sleep disorders.
CBT-I, in particular, is an evidence-based intervention for chronic insomnia. It addresses maladaptive thoughts and behaviors associated with sleep and helps patients develop healthier sleep patterns.
Although CBT-I is fundamentally different from religious incubation, both approaches illustrate the importance of psychological preparation and the relationship between mental experience and sleep.
Historical evidence of incubation healing
The historical importance of incubation is supported by archaeological findings, inscriptions, and literary accounts. The healing inscriptions of Epidaurus, known as iamata, describe patients’ illnesses and their reported cures. These records provide valuable evidence concerning the therapeutic practices and beliefs associated with the sanctuary.
Some inscriptions describe extraordinary or miraculous outcomes, which must be interpreted cautiously. They reflect the religious and promotional character of ancient healing institutions and cannot independently establish the effectiveness of particular treatments. At the same time, archaeological and literary evidence suggests that the sanctuaries offered more than purely symbolic healing.
A study published in 2002 examined descriptions of surgical cures at Epidaurus and discussed the possibility that certain procedures involved actual medical interventions performed during sleep induction, potentially using soporific substances. The authors considered the descriptions of several interventions sufficiently realistic to warrant historical investigation.
This evidence illustrates the coexistence of religious practices, empirical observation, and medical intervention. The Asclepieia should therefore be understood as historically complex institutions whose therapeutic activities cannot be reduced either to miraculous healing or to fully developed scientific medicine. Their significance lies in the gradual interaction between traditional beliefs and practical approaches to illness.
Implications for modern-day medical practice
The historical study of therapeutic sleep incubation offers several lessons for modern healthcare.
First, the therapeutic environment matters. Quiet, comfortable, and reassuring surroundings can support sleep, reduce distress, and improve the patient’s experience of treatment.
Second, expectations should be addressed ethically. Patients benefit from realistic explanations, encouragement, and confidence in their treatment. Healthcare professionals should promote hope without promising outcomes that scientific evidence cannot support.
Third, sleep deserves greater clinical attention. Sleep assessment should be incorporated into appropriate medical evaluations, particularly when patients experience chronic pain, psychological distress, or prolonged hospitalization.
Fourth, treatment should be individualized. The ancient sanctuary recognized that patients arrived with different complaints and needs. Modern personalized medicine develops this principle through clinical assessment, patient preferences, and evidence-based treatment selection.
Finally, the psychological dimension of illness should not be neglected. Anxiety, fear, uncertainty, and social isolation can influence the experience of disease. Integrating psychological support into medical treatment can improve patient well-being without diminishing the importance of biological mechanisms.
These lessons from ancient Greek sleep therapy are especially relevant to contemporary approaches that combine conventional medical treatment with psychological interventions, rehabilitation, sleep management, and supportive care. Modern healthcare has developed scientific methods for understanding sleep, diagnosing disease, and evaluating treatment effectiveness. Yet the importance of patient-centered care, psychological reassurance, and restorative sleep remains fundamental.
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