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Deep Sleep 101 (Blue Marble's Music Guidebook Collections)
Deep Sleep 101 - Blue Marble's Music Guidebook Collections Author:Gregg D. Jacobs Blue Marble has combined a concise guidebook of essential knowledge to improve sleep (written by a leading expert from Harvard) with a CD of relaxing music. Why is there a CD in a sleep book? Recent studies have shown that there is an important connection between music, relaxation and sleep.