Each of us wants to be happy,calm,satisfied,each of us sees joy in something else,there are those who are not quite able to find joy in everyday life,overwhelmed by the mass of duties,we lose our own "I" interests,but also time for "catching a breath”,each day becomes a“jungle”where there is a struggle to survive and then go to sleep as one form of regeneration. If it had not been for the night,many of us would have completely quit sleeping until our organism was completely exhausted.