user7648: But when an enlightened person lives he could be in the present all the time. But when you sleep your conscious/awareness may be different or just disappear. 
So does the level of awareness of an enlightened person also change or stay the same even when sleeping.

user7548: sleep is a state of body, not a state of mind. If you are asleep your body has shut down the 5 senses, but your mind can still be active (dreaming).

"As for those delusion-born fevers — burned with which the householder or householder's son would sleep miserably — that delusion has been abandoned by the Tathagata, its root destroyed, made like a palmyra stump, deprived of the conditions of development, not destined for future arising. Therefore he sleeps in ease. - AN 3.34

If you are practicing mindfulness and meditation regularly you can actually stop nightmares from happening by this habit.

7648: <p>But when an enlightened person lives he could be in the present all the time. But when you sleep your conscious/awareness may be different or just disappear. </p>

<p>So does the level of awareness of an enlightened person also change or stay the same even when sleeping.</p>
 7548: <p>sleep is a state of body, not a state of mind. If you are asleep your body has shut down the 5 senses, but your mind can still be active (dreaming).</p>

<blockquote>
  <p>"As for those delusion-born fevers — burned with which the householder or householder's son would sleep miserably — that delusion has been abandoned by the Tathagata, its root destroyed, made like a palmyra stump, deprived of the conditions of development, not destined for future arising. Therefore he sleeps in ease. - <a href="http://www.accesstoinsight.org/tipitaka/an/an03/an03.034.than.html" rel="nofollow">AN 3.34</a></p>
</blockquote>

<p>If you are practicing mindfulness and meditation regularly you can actually stop nightmares from happening by this habit.</p>
