Abstract
Traditional medicine scientists believed that sleeping under the stars and moonlight is not healthy because it brings about nose bleeds and respiratory problems. In Avicenna's view, the spirit and its tendency to the light are introduced as main etiology, which cannot explain star light as a proper etiology. In modern knowledge, it seems cosmic rays that reach our planet’s atmosphere by electron cascade, play a key role. Internal organs’ electrical charge distribution disturbance caused by these electrons can lead to irregular spasms in the muscular walls of arteries and other organs. These interactions may finally lead to circulation (epistaxis and hypertension) and respiratory (catarrh) problems.
 
Keywords: Avicenna; Epistaxis; Hypertension; Catarrh; Sleep; Cosmic rays

 

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