By age three the amount of sleep needed has dropped to 12 hours, and by age five to six the child and mother are arguing over the nap. Beginning in the teen years, your adult pattern of sleep develops. Some people require seven to eight hours of sleep while others can make do with four to five and a half. Still others can not function with less than 12 hours of sleep. Musical sounds have regular wave patterns unlike the sounds we classify as noise.
Noise shows irregular wave patterns.
The pitch of both music and sound relies on the frequency of its vibrations. The amplitude of the sound wave decides the volume of a sound. Making vibrations are how musical instruments produce their tones. For example, in wind instruments, vibrations in columns produce tones. The two different kinds of sleep are REM and NREM sleep.