Enter/Leave the Realm of the Dreaming

This spell instantly transports you and up to 8 creatures, willing or otherwise, of your choice that are within ten feet of you, going into either a sleeping person's mind or into the realm of the dreaming, the second of which can only be done when the user falls asleep wearing the helm.
If going into a sleeping mind then the user will always be placed near their dream-self, meaning the user can see what the sleeping person is dreaming of.
If going into the Realm of the Dreaming, then the user willl be placed in the throne room of the Grand Palace.
If leaving the Realm of the Dreaming, you can do so at a thought, however those accompanying you must be within 10 feet, or be trapped in an endless slumber from which they won't awake until you return to the Realm of the Dreaming, and bring them home. The same is the circumstance when leaving a sleeping mind.