One that plays soothing sounds, like dogs barking or seagulls fighting over trash, probably.

It might even project the moon phase on the ceiling.

Something like this: https://www.amazon.co.uk/dp/B008LR3KD8/

The idea is that it wakes you up gently by flooding the room with light resembling a natural sunrise. One reason that it might be expensive is that it needs a lot of high luminance hue shifting LEDs, and possibly I overpaid a bit (there do seem to be much cheaper competitors) but it was still a good investment because it does make my mornings a lot more pleasant.