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You can set multiple alarms with different bedtimes and wakeup times, which is really handy if your schedule is all over the place or you want to allow yourself to sleep in more on certain days. My only real complaint so far is that the sunrise feature isn't quite as strong as I want it to be. The Dreamie's sunrise goes from a warm glow to a bright blue-white, but it never gets big enough to wash over me in the way I expect a sunrise alarm to. Having the light on is helpful for orienting yourself when you're groggy and half-asleep, but it doesn't feel like it's having much effect on my actual wakeup process.
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The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.