Satan will try to put us to sleep in prayer. And he does so, most commonly, by tricking us into staying up too late the night before.
from Desiring God http://rss.desiringgod.org/link/10732/15400047/sustain-your-prayer-life-with-sleep
via DG
Satan will try to put us to sleep in prayer. And he does so, most commonly, by tricking us into staying up too late the night before.