"A painless sledgehammer pounding in her brain" haunted a 77-year-old woman for 15 years, preventing sleep and causing immense suffering, until physicians finally identified the rare cause: Exploding Head Syndrome."
For fifteen years, the simple act of falling asleep was a nightly ordeal for a 77-year-old woman, marked by an inexplicable and terrifying sensation. As she drifted towards slumber, she experienced what she vividly described as a "painless sledgehammer banging in her brain." This jarring jolt would shock her awake, leaving her in a state of profound anxiety. Her coping mechanism became a desperate battle against exhaustion, forcing her to remain awake until she was so depleted that the phantom blow could no longer rouse her. By the time she finally sought medical intervention for her debilitating insomnia, her sleep schedule had become severely disrupted, with sleep often not commencing until the early hours of 4 a.m. This harrowing experience, which underscores the profound impact of often-misunderstood sleep disorders, highlights the critical need for accurate diagnosis and compassionate care.
Physicians at Corewell Health William Beaumont University Hospital in Royal Oak, Michigan, ultimately identified the root of her suffering as Exploding Head Syndrome (EHS), a parasomnia characterized by sudden, loud noises or sensations of explosions perceived by the individual as they fall asleep or wake up. While not life-threatening, EHS, as described by the authors of the case report, can inflict "tremendous suffering." The detailed account of her case, authored by two Corewell Health East fellows and a colleague, has been presented in the abstract supplement of the journal Sleep for SLEEP 2026, the 40th annual meeting of the Associated Professional Sleep Societies.
A Diagnosis Elusive for Fifteen Years
The patient’s medical history was significant, including pre-existing conditions such as headaches, anxiety, chronic insomnia, and obesity. Over the years, she had undergone numerous brain imaging studies in an effort to uncover the cause of her distress. These investigations, however, consistently failed to reveal any signs of stroke or other acute neurological issues. Despite these repeated examinations and consultations with neurologists regarding the perplexing, painless head explosions, a definitive diagnosis remained elusive.
During her diagnostic journey, she was prescribed a variety of headache medications. Only gabapentin demonstrated a measurable reduction in the severity of her episodes. Crucially, she reported no pain, numbness, or abnormal movements associated with these events, though she did admit to experiencing mild snoring. Her sleep pattern, once she finally succumbed to exhaustion, was characterized by approximately seven hours of continuous sleep. This pattern strongly suggested that the primary problem occurred at the precise moment of falling asleep, rather than being a pervasive issue throughout the night. The authors of the case report emphasized that the parasomnia had been overlooked despite multiple medical evaluations, a delay that had profoundly disrupted her life for an extended period.
Phantom Blasts at the Precipice of Sleep
The International Classification of Sleep Disorders, Third Edition (ICSD-3) categorizes EHS among other parasomnias, a group of sleep disorders characterized by undesirable experiences that occur around the onset of sleep, during sleep, or during arousal from sleep. Individuals experiencing EHS typically perceive a sudden, loud noise or a sensation of an explosion emanating from within their head as they transition into sleep. While patients commonly describe sounds akin to thunder, blasts, gunshots, or electrical crackling, the woman’s description of a "sledgehammer" was a notable, albeit less typical, manifestation of the syndrome.
The American Academy of Sleep Medicine, in its patient guide to exploding head syndrome, clarifies that these episodes are generally painless. They may sometimes be accompanied by a visual flash of light or a minor muscle jerk. The frequency of these events can vary significantly, ranging from infrequent occurrences to multiple episodes within a single night. The alarming nature of these sensations often leads individuals to fear they are experiencing a stroke. While diagnostic testing is not typically required, a sleep study may be recommended if the episodes severely disrupt a person’s sleep. The precise cause of EHS remains a subject of ongoing research. A prominent theory suggests that it may be linked to the complex process of the brain powering down for sleep. During this transition, neurons responsible for movement, hearing, and vision are thought to deactivate in stages. Researchers hypothesize that in individuals with EHS, the auditory neurons might misfire and activate simultaneously, leading to the perceived explosion.
More Prevalent Than Its Obscure Reputation Suggests
For a considerable period, EHS was widely considered a rare condition, predominantly affecting individuals over the age of 50. However, this perception began to shift in 2015 when Brian Sharpless, then a psychologist at Washington State University, challenged this notion with a groundbreaking study involving college students. In his research, 18% of the 211 undergraduates interviewed reported experiencing EHS at least once, and over a third of these individuals also reported experiencing isolated sleep paralysis.
Estimates of EHS prevalence can vary depending on the strictness of the diagnostic criteria employed. A subsequent survey conducted among government employees in Japan, involving 1,843 eligible participants, found that 2.49% reported experiencing sudden noises or sensations of explosions. Of this group, 1.25% met the formal diagnostic criteria for EHS. This study also revealed a significant correlation between EHS and higher scores for depression, anxiety, insomnia, and fatigue, even after accounting for factors such as age, sex, body mass index, and sleep duration. However, as the survey captured data at a single point in time, it was unable to establish a causal relationship, meaning it could not definitively determine whether EHS preceded or followed these other conditions. The notable overlap between EHS and insomnia, as observed in these studies, makes the Corewell case particularly striking. In this instance, a seemingly benign parasomnia appears to have been the direct driver of a decade and a half of deliberate sleep deprivation.
Reassurance and a Sleep Study Bring Relief
Following the diagnosis of Exploding Head Syndrome, the medical team at Corewell Health provided the patient with extensive counseling and reassurance regarding the benign nature of her condition and its prognosis. Subsequently, she underwent polysomnography, an overnight sleep study, to meticulously assess for other potential sleep disturbances, such as obstructive sleep apnea and other parasomnias.
Contrary to her ingrained expectation of sleep onset near 4 a.m., the patient experienced a remarkable shift during the study. She fell asleep at 11:10 p.m., with a sleep latency of 74 minutes – a dramatic improvement compared to her usual home latency exceeding 360 minutes. She reported sleeping more soundly during the study than she had in years at home, and crucially, experienced no EHS episodes during the polysomnography. The sleep study also identified mild obstructive sleep apnea, with an apnea-hypopnea index of 11.49 breathing events per hour. The authors concluded that the combination of counseling and reassurance led to a significant improvement in her sleep quality during the study, marking the best sleep she had experienced in the preceding fifteen years.
It is important to note that this report details a single patient’s experience during one night in a sleep laboratory. The published abstract does not include long-term follow-up data, and therefore, it cannot definitively establish that reassurance alone will resolve EHS for all individuals. Nevertheless, this approach aligns with findings from earlier research. A 2020 case series involving six patients indicated that three individuals improved with reassurance and the management of coexisting sleep disorders, while the other three responded favorably to the antidepressant amitriptyline.
The evidence base for definitive EHS treatments remains relatively thin. As noted by Brian Sharpless in 2015, there were no "well-articulated or empirically supported treatments available." For individuals who repeatedly experience loud, unexplained noises during the transition to sleep or upon waking, particularly if these episodes disrupt their sleep or are accompanied by other neurological symptoms such as headache, weakness, or numbness, consulting a qualified clinician or sleep specialist is paramount to rule out other potential underlying causes.
Key Questions Answered
What is Exploding Head Syndrome?
Exploding Head Syndrome (EHS) is a parasomnia characterized by the perception of a sudden, loud noise or a sensation of an explosion within the head as an individual falls asleep or wakes up, typically without associated pain.
Is Exploding Head Syndrome dangerous?
While EHS is not considered life-threatening, it can induce significant fear, anxiety, and, as demonstrated in this case, severe disruption to sleep patterns, impacting overall well-being.
Why was this case unusual?
This particular case was unusual due to the patient’s unique description of a "painless sledgehammer" sensation, differing from the more commonly reported sounds like gunshots or thunder. Furthermore, the patient endured fifteen years without a diagnosis, actively avoiding sleep until the early morning hours to circumvent the episodes.
How common is it?
Prevalence estimates for EHS vary. A 2015 study indicated that 18% of college students had experienced it at least once, while a Japanese workplace survey found that 1.25% met formal diagnostic criteria.
When should someone see a doctor?
Individuals experiencing frequent EHS episodes, particularly if these episodes disrupt their sleep or are accompanied by symptoms such as headache, weakness, or numbness, should consult a healthcare professional or sleep specialist for proper evaluation and diagnosis.
