They promise us success in the role God called us to function in and enough money to escape the poor house. Meditation is one of God's key sources of healthy bodies. This isn't saying eat anything and forget about adequate sleep and exercise. Meditation is one necessary facet of proper care for your body. In the next chapter Solomon instructs his Son to meditate and memorize scripture and tells him what the reward will be.
Meditation produces joy and praise which restores our soul.
When you can't sleep at night, turn the precious promises of God's word over and over in your mind and a peace will flow over you. Its a peace as satisfying as the richest food your taste buds can savour. Life is too precious to miss the wisdom, success, joy and physical, emotional and spiritual health meditation gives us. Meditation is a quiet reflection upon the words of Scripture. Thy testimonies are my meditation.