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During evening practice sessions, 32 nonpianist musicians learned a short melody on piano, and then either learned a second short piano melody, learned a difficult unfamiliar piece on their principal instruments, practiced familiar material on their principal instruments, or engaged in no other music-related motor behavior prior to sleep; practice on the target melody was limited in terms of time and number of repetitions. All participants returned the next morning and were tested on their performance of the target piano melody. Previous research has revealed overnight enhancement of skills as a result of sleep. In the current study, however, our participants showed significant "decrements" in performance between evening training and morning test, though the extent of the decrements varied. We speculate that the lack of overnight improvements may have resulted from our regulating participants' practice of the target melody during the training sessions and that strict, limited practice protocols may interfere with consolidation-based memory enhancement.