from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A terrifying experience, having the characteristics of a nightmare, during wakefulness
from the GNU version of the Collaborative International Dictionary of English
- n. A kind of incubus which occurs during wakefulness, attended by the peculiar pressure on the chest which characterizes nightmare.
from The Century Dictionary and Cyclopedia
- n. A feeling resembling that experienced in nightmare, but felt while awake.
From day and nightmare (Wiktionary)