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The function of rapid-eye-movement (REM) sleep is still unknown. One prevailing hypothesis suggests that REM sleep is important in processing memory traces. Here, using positron emission tomography (PET) and regional cerebral blood flow measurements, we show that waking experience influences regional brain activity during subsequent sleep. Several brain areas activated during the execution of a serial reaction time task during wakefulness were significantly more active during REM sleep in subjects previously trained on the task than in non-trained subjects. These results support the hypothesis that memory traces are processed during REM sleep in humans.

not only prolongs but also paradoxically catalyzes the pleasure of direct penile excitations, because adding pressure on the pressure point that is about to explode, pushing the limit right before the point of no return for orgasm, is extraordinarily arousing. Beyond the intense euphoria gained from the excitements of holding back the ejection of body fluid, which constitutes the raison d=être for delaying the ultimate climax, perhaps, hysterically seeking a "bowl" for receiving the "urine" in dreams underscores the difficulty of gratifying the sexual wish that young men most desperately long for in waking life.

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