Daniel 2:1 (BSB)

In the second year of his reign, Nebuchadnezzar had dreams that troubled his spirit, and sleep escaped him.

From Daniel 2. Also in the ESV.

Commentary on Daniel 2:1

• John Calvin (Reformed), Calvin's Commentaries on Daniel 2:1: Daniel here says, — King Nebuchadnezzar dreamt in the second year of his reign. This seems contrary to the opinion expressed in the first chapter. For if Nebuchadnezzar besieged Jerusalem in the first year of his reign, how could Daniel be already reckoned among the wise men and astrologers, while he was as yet but a disciple?
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Daniel 2:1-13: We meet with a great difficulty in the date of this story; it is said to be in the second year of the reign of Nebuchadnezzar, Dan 2:1. Now Daniel was carried to Babylon in his first year, and, it should seem, he was three years under tutors and governors before he was presented to the king, Dan 1:5. How then could this happen in the second year?
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Daniel 2:1: And in the second year of the reign of Nebuchadnezzar,.... It was in the first year of Nebuchadnezzar's reign that Daniel was carried captive, Jer 25:1, three years Daniel had been under tutors; at the end of which he was presented to the king, as is related in the preceding chapter; and yet the following dream was in the second of his reign: this creates...
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Daniel 2:1: And in the second year of the reign of Nebuchadnezzar Nebuchadnezzar dreamed dreams, wherewith his spirit was troubled, and his sleep brake from him. (a) The father and the son were both called by this name, so that this is meant of the son, when he reigned alone: for he also reigned in a way with his father.