HC + Sandy's home the island of Sleepy Sands
It's known that the Island of Sleepy Sands formed when a shooting star fell to Earth and now floats above the oceans. There is no landmass that anchors it in place and the island is known to drift freely from the tides, making it nearly impossible for humans to find.
The free-flowing nature of this island lends itself to shapeshifting dunes of dreamsand with an everchanging landscape. A physical manifestation of the the dream world, constantly shifting and adapting to the dreams and wishes of those who sleep. If every grain of dreamsand contains a dream, the island is not just a place, but a living entity that changes with the collective desires of humanity's slumbering minds.
Just as a nightmare turns the sand black, various parts of the island might resemble tranquil, serene landscapes. Others may be more energetic and filled with various projections of dreams. The sand pulses with color during a particularly eventful night. Being the diligent guardian he is, only good dreams are sought out, collected, and distributed of course.