the GNU version of the Collaborative International Dictionary of English
adj. Pertaining to sleep or dreams; somnial.
The Century Dictionary and Cyclopedia
Of or pertaining to dreams or dreaming; relating to or producing dreams; somniative.
Word Usage
"Nevertheless, cost what price it will, or whatsoever come of it, I heartily condescend thereto; protesting that I shall to-morrow break my fast betimes after my somniatory exercitations."