Nightmare & Dream "Dimensions"

     I've been through some under review posts, & have found two very interesting posts: the sky lands & the dream biome. When I saw these, I had an idea. What if those two ideas were made into one? Every night, when the players all go to sleep, they could all be "transported" to another world for 3-5 minutes. It would be different each time, & completely random. Sometimes it would be peaceful, with dream-exclusive ores (you get to keep these when you wake up, by the way), & maybe even a beautiful mansion. Other times, you would appear in a place of nightmares. Dreams & nightmares both have some of the mobs we all know, as well as some new ones that are only found in dreams & nightmares. They can be caught & brought to the overworld using a Dream or Nightmare bottle. They are crafted using a bottle & 4 dream or nightmare ores. Unlike other items, you will still be holding them when you fall asleep. Also, there is a slim chance for a new boss to spawn in nightmares: the Nightmare worm. It is similar to the "void worm" concept, & destroys blocks. 13 & 11 play constantly in nightmares. Also, Herobrine tends to appear here as another nightmare boss. There is a 0.0001% chance for the player to spawn in a vault full of all of the ores in the game in chests in dreams. The same happens in the nightmare realm- but with mimics instead of chests!

Please vote! I'd love to hear your ideas in the comments! (I'll explain certain parts in-depth in the comments as well)