Dear Editors,The paper "Excessive yawning and thermoregulation: two case histories of chronic, debilitating bouts of yawning" by Gallup and Gallup [1] deals with an interesting and potentially important topic. Yet, there are problems concerning it.The patients never met the investigators, only providing subjective reports. On the basis of the two cases of pathological yawning that may be etiologically unrelated, conclusions are drawn concerning yawning in general.The medical histories contain contradictions, and no details are given concerning blood tests and MRI investigations. Both patients are reported to suffer from excessive yawning in the absence of sleep problems. Yet, both had received sleep-related diagnoses (patient 1 received diagnoses of narcolepsy and excessive daytime sleepiness-and the same diagnoses were ruled out, and patient 2 was diagnosed with sleep apnoea).
展开▼
