D&D5E: Dreamwalker (Character Class)

I have created a character class called The Dream Walker. I wanted to create a character that would make long-rests more interesting and relevant to the game. Rather than a party simply bunking down for the night, setting up a watch, and hoping there are no rogue owlbears or enemy scouts, I created a character who had a selection of unique spells (called Somnia) that are cast only during while asleep at a long rest. 

This is a Wisdom-based support/utility character, and is a mix between a Warlock and a Bard. From the character description (available for download): Dream Walkers are rare souls who can pass into and out of the dream plane as naturally as others walk across fields or climb mountains. Dream Walkers can pass into the dreams of others to incept ideas or concepts, can interrogate another’s darkest desires, or inspire abilities in their allies. Meanwhile, they can call upon the forces that exist within the dream plane and exert them upon the material plane. Their spells tend to follow dream logic - size and scale become unstable, movement is impeded or aided, appearances of things change while the essence remains, and movement between locations becomes instantaneous. 

The character has (normal) spells like a Warlock, in that they do not have many prepared spells, but they have spells at a high slot-level. The spells also replenish during a long rest, but the duration of a long rest becomes 4 hours at level 5, 2 hours at level 12, and 30 minutes at level 16. 

Moreover, I have created 20 unique Somnia spells. A single Somnia can be cast during any long rest, but no preparation is required. At low levels the Somnia allow the Dream Walker to inhabit an control an animal's mind, detect life at long range, give allies temporary HP for the next day, or interrogate other sleepers for information. At middling levels the Dream Walker can incept in others commands that activate upon a spoken trigger word, can cause others to forget information, or alter other's dispossion towards the Dream Walker and their party. At the highest levels, the Dream Walker can possess powerful and intelligent creatures as they sleep, incept complex and long-term commands, or cause creatures to enter an unwaking week-long sleep.