Having pleasant thoughts and fantasies about imaginary things while awake, rather than paying attention to what's happening around you.
Combines 'day' and 'dreaming'—first recorded in the 1800s. It contrasts with nighttime dreams because you're consciously aware you're in the real world, yet mentally transported elsewhere.
For decades, teachers scolded daydreamers as lazy, but neuroscience now shows that mind-wandering activates the 'default mode network'—the same brain state used for creativity, problem-solving, and planning your future. Your brain does important work while you're 'staring out the window'!
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