At night, in the quiet moments before sleep, a person's mind naturally drifts toward their deepest worries and desires. For an emperor commanding a vast empire, these late-night reflections inevitably center on the fate of his kingdom and the legacy he will leave behind.
Daniel approaches the king and explains that his unsettling dream was not a random occurrence, but a direct response to his own inner turmoil [מצודת דוד]. The heavy thoughts that occupied the ruler during the day had followed him into the night, surfacing and overwhelming him as he lay in bed [רש"י, אבן עזרא]. These reflections [רש"י, מצודת ציון] revolved around a pressing anxiety regarding what would happen after his reign ended. He wondered who would take his place and whether the mighty empire he had built would endure [מצודת דוד, יוסף אבן יחיא]. As the ruler of much of the known world, it was only natural for him to seek out the hidden truths of the future [ביאור שטיינזלץ].
This raises a profound question: why would God share sweeping historical secrets with a foreign king who did not worship Him? Furthermore, if dreams typically mirror ordinary daily thoughts, how could a person dream of the distant end of days? The answer lies in the king's own mental focus. His intense preoccupation with the future acted as a proper preparation, creating an opening for God to reveal a vision to him [מלבי"ם].
The king's personal concerns were limited to the immediate future and his direct successors. However, God, the revealer of secrets, chose to broaden the scope of the vision for the sake of His own honor. Instead of merely showing the king what would happen immediately after his reign, God revealed the entire unfolding of history. He answered the king's immediate questions while simultaneously projecting the full sequence of global events all the way to the end of days [מלבי"ם, אלשיך].