b) According to statistics, those who sleep at night the chances of cancer five times higher than normal.

c) human beings already living in the rhythm of the world, unable to sleep or food reserves in advance, we can not reverse the day and night.

d) the human body organs by the autonomic nervous system control of sympathetic nerve activity during the day mainly at night by the parasympathetic nerves work, if so confused and upside down, it is also riddled with breeding.

3. Emotions get too excited about

a) civil society can cause stress.

b) work or mental stress.

c) When a person is, after mental stress, once stress relaxation, would result in death, known as the potential vice renal cortical insufficiency syndrome.