Detect Dreams

You peer into a target creature's mind momentarily to gather details from the last dream they had. An unwilling target can make a Wisdom save using your Spell save DC to resist this effect. Elves and Fey have advantage on this save. A target that successfully saves against this effect cannot be targeted again until the next time they sleep.

Dreams are rarely easy to interpret, and it's at the DM's discretion what, if any, usable information can be gleaned.