Dreamscape

A 5-foot-radius immobile bubble of ethereal protomatter comes into existence around and above you.  The space within the bubble is extradimensional and is twice as big as it appears on the prime material plane.  The spell ends if you walk more than 30 feet from the bubble.

Up to six creatures of Medium size or smaller can stay inside the bubble with you at any given time. The spell fails if its area includes a larger creature or more than six creatures. Only creatures and objects that you allow can enter the bubble, but, once they are given access, they can enter it at will.  Creatures and objects without permission to enter pass through the bubble as though it was incorporeal.  Spells and other magical effects can't be cast through the wall of the bubble.

The temperature and appearance of the space inside the bubble can be whatever you desire, and any part can be made to reveal the outside world.  From the outside, the bubble is transparent and easy to miss, especially in dim light.  Within 60 feet, a DC 15 perception check is required.  Farther than 60 feet, the perception DC increases to 20.  

Time within the bubble flows at the twice the normal rate, so everything outside of it behaves as though affected by a slow spell, and short and long rests take half as long to complete.