Daniel 2:1

The second year of the reign of Nebuchadnezzar - That is, the second year of his reigning alone, for he was king two years before his father's death. See the notes on Daniel 1:1 ; (note). This was therefore the fifth year of his reign, and the fourth of the captivity of Daniel.

Nebuchadnezzar dreamed dreams wherewith his spirit was troubled - The dream had made a deep and solemn impression upon his mind; and, having forgotten all but general circumstances, his mind was distressed.