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If the recipient is awake when the spell begins, you can choose to cease casting (ending the spell) or to enter a trance until the recipient goes to sleep, whereupon you become alert again and complete the casting. If you are disturbed during the trance, you must succeed on a Concentration check as if you were in the midst of casting a spell or the spell ends.
If you choose to enter a trance, you are not aware of your surroundings or the activities around you while in the trance.
You are defenseless, both physically and mentally, while in the trance. (You always fail Reflex and Will Saving Throws, for example.)
Creatures who don't sleep (such as outsiders) or dream are immune to this spell.