undisturbed by dreams: a sound and dreamless sleep.

1595–1605; dream + -less

dreamlessly, adverb
dreamlessness, noun
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World English Dictionary
dream (driːm)
1.  a.  mental activity, usually in the form of an imagined series of events, occurring during certain phases of sleep
 b.  (as modifier): a dream sequence
 c.  (in combination): dreamland Related: oneiric
2.  a.  a sequence of imaginative thoughts indulged in while awake; daydream; fantasy
 b.  (as modifier): a dream world
3.  a person or thing seen or occurring in a dream
4.  a cherished hope; ambition; aspiration
5.  a vain hope
6.  a person or thing that is as pleasant, or seemingly unreal, as a dream
7.  go like a dream to move, develop, or work very well
vb (when intr, foll by of or about) (foll by of) , dreams, dreaming, dreamed, dreamt
8.  (may take a clause as object) to undergo or experience (a dream or dreams)
9.  (intr) to indulge in daydreams
10.  (intr) to suffer delusions; be unrealistic: you're dreaming if you think you can win
11.  to have an image (of) or fantasy (about) in or as if in a dream
12.  to consider the possibility (of): I wouldn't dream of troubling you
13.  too good to be true; ideal: dream kitchen
Related: oneiric
[Old English drēam song; related to Old High German troum, Old Norse draumr, Greek thrulos noise]
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But, deep dreamless sleep would take you down to the lowest frequency.
Then the day ended not, and night was a dreamless terror, and joy and sleep
  slipped away.
Their adult companions will be driven to dreamless slumber.
It's what you lose when you fall into a deep, dreamless slumber and what you
  regain when you wake up.
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