reality

• To come down to earth with a bump

  To face reality and the difficulties of a situation after a period of unrealistic optimism or fantasy, often with a sudden and harsh realization.

• Bring someone back down to earth

  To make someone confront reality, especially after they have been overly optimistic, arrogant, or unrealistic.

• Shatter someone's illusions

  To reveal the harsh truth about something someone previously believed to be good, true, or pleasant, causing disappointment or disillusionment.