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Rearrange the sentences P, Q, R, and S between the fixed first (S1) and last (S6) sentences to form a logical paragraph. S1. Yawning or its absence has been related to various clinical conditions. P. Interestingly, some clinicians claim that those with acute physical illness don't yawn until they are on the road to recovery. Q. It can be a symptom of brain lesions, haemorrhage, motion sickness and encephalitis. R. But what is currently known about yawning is essentially anecdotal, mostly because the yawn has not got the respect it deserves. S. On the other hand, it has been reported that psychotics rarely yawn, except those suffering from brain damage. S6. It is in reality a releasing stimulus.