I believe God's word that we should rest. He set the example by resting after creation. Genesis 2:2. Our bodies need rest from the stresses of the week. Keep that in the mind whenever you begin to get overworked or stressed. Remember that we need to give our bodies proper rest!
A cold bug is minimal to the deceases that some face...but we all have the same healing available from the great Creator and Healer.
I like this gentle song that reminds us that God is our Healer
Psalm 30:2 (NIV)
Lord my God, I called to you for help, and you healed me.
I give thanks that God directs us to rest and gives us healing in His Wisdom and through His Grace.