Is what happened to me—seeing the sun as a living being that feels and looks at me, accompanied by a sense of tranquility—a religious interpretation, or is it merely figments of imagination?

Perhaps what occurred in your heart by way of meanings is among the effects of tranquility. For the remembrance of Allah Almighty is one of the causes for the heart's serenity, transparency, and harmony with the universe, which glorifies its Lord and Creator with His praise, in affirmation of His (the Almighty's) saying: "Those who have believed and whose hearts are assured by the remembrance of Allah. Unquestionably, by the remembrance of Allah hearts are assured."