Proper rest is essential for the body to recharge and restore the system. When resting the body , it has the chance to clean up, and remove what needs to be removed. When sickness comes we naturally want to sleep, this is because during the stillness of the body, it is able to be restored to health. Psalms (46 : 10). Be still and know that I am God: I will be exalted among the heathen, I will be exalted in the earth. If we be still in the presence of the Lord he will heal, physically, mentally, and spiritually.
Not only in sickness are we to rest. Genesis( 2 : 3 ) And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made. We are to rest from physical labour. The Lord makes it plain in Exodus (20 : 8-11) by stating REMEMBER the sabbath day to keep it Holy. Jesus calls us to rest in him. Matthew (11 : 28-29). Come unto me, all ye that labour and are heavy laden, and I will give you rest. Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and you shall find rest unto your souls. Mark (6:3). Jesus bids the apostles to rest for a while, after the stress of the beheading of John the Baptist.
So rest is very important in all aspects of life. Jesus will give you complete rest if we trust in him. Hebrews (13 : 5) God will never leave nor forsake thee.
As God intended
Genisis 2 v 3