The Sandman

For some of the main clouds at the end of the sequence, I used X-Particles.
I rendered them out in Cycles4D, and comped in After Effects.

The main sequence, along with the majority of the other clouds, has been rendered in Eevee, Blender.

I then did some exploration for fun, mostly to improve my 3D sculpting skills.
I sculpted the letters in 3D Coat, and then rendered in Cycles, Blender.
The compositing was done in Blackmagic Fusion.