Over the past couple of years, Stickgold has teamed up with Matthew Walker at Boston's Beth Israel Deaconess Medical Center to investigate sleep's effects on procedural memory for motor skills. They asked right-handed test subjects to type a sequence of numbers (for example, 4-1-3-2-4) with their left hand over and over again as fast as they could. No matter what time of day they learned the task, their accuracy improved 60% to 70% after six minutes of practice. When subjects who learned the sequence in the morning were retested 12 hours later, they hadn't significantly improved. But when those who learned the sequence in the evening were retested following a night's sleep, they were an extra 15% to 20% faster and 30% to 40% more accurate.
Read more: http://www.time.com/time/magazine/artic ... z0cL3YcAP4
This and other research into effects of sleep suggest that during sleep the human mind continues to subconsciously practice motor skills practiced shortly before going to sleep. If true, guitar practice late in the evening may be significantly more beneficial than the same amount of practice early in the morning. (Assuming, of course, that we sleep during the night rather than during the day.)
-Bob
