When you go to sleep your heart starts beating slower your muscles relax and you start breathing less. In the first stage you are not worried, second step you don't think well. It is good for the body to sleep 8 hours a night. After the 4th stage your eyes start moving quickly it is called REM it stands for Rapid Eye Movement. You can not sleep with your eyes open because there are little muscles that close your eyes to relax. When the eyes close it is good for the brain and it keeps your eyes moist.
Sound is a kind of energy. When something vibrates it makes sound. Like you vocal cords.
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