You and a up to five of willing creatures within range fall into a deep slumber and become unconcious for the duration.During that time all affected creatures can  share words, images, sounds, and other sensory messages with one another.In addition, you can choose  one of the following effects, effecting all chosen creatures.At the end of the spells duration the affected creatures gain the benifits of a long rest.You do not regain the spell slot uses to cast this as part of the long rest

inspiring dream

The targets gain inspiration (if your dm does not use inspiration they instead gain temp hp equal to twice their proficiency bonus).

training dream 

The targets gain proficiency in a skill of your choice that you have proficiency in until they take a long rest.

combative dream 

Each affected creature takes psychic damage equal to twice the  level  of this spell was cast at.Until, they next take a short rest their proficiency bonus increases by 1.

magical dream

All affected creatures, knows a cantrip of their choice until the end of the next long rest.

At higher levels 

when cast using a spell slot of 6th level or higher you can choose an additional affect per level of spell above 5th.You can choose magical and training dream more then once though all other effects can only per used once per casting of the spell.