the GNU version of the Collaborative International Dictionary of English
n. One who, or that which, awakens.
The Century Dictionary and Cyclopedia
n. One who or that which awakens or arouses from sleep or inaction.
Word Usage
"Another over-watchful Newbury "awakener" rapped on the head a nodding man who protested indignantly that he was wide-awake, and was only bowing in solemn assent and approval of the minister's arguments."