num_pages: 52
description: 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.
language: English
title: Deep Sleep 101
titlecomplete: Deep Sleep 101
ratings_count: 4
publisher: Blue Marble Llc