Definition & Meaning of "like a dream"

What is the origin of the idiom "like a dream" and when to use it?

The idiom "like a dream" likely originated from the idea of dreams being perfect, smooth, or idealized experiences, often without any problems. In the past, dreams were often associated with pleasant, flawless occurrences, so describing something as happening "like a dream" suggests that it unfolded effortlessly and without trouble. Over time, this comparison became commonly used to describe things that worked out in an almost perfect or flawless way, much like how dreams can feel idealized or effortless.