Unnaturally sound sleep

• Profound sleep
• Very deep sleep
• Rip Van Winkle's state
• Deep, deep sleep
• Lethargic sleep

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
Latin, "deep sleep, lethargy," from PIE *swep-os- , suffixed form of root *swep- (1) "to sleep" (see Somnus ).

Wiktionary Word definitions in Wiktionary
n. an unnaturally deep sleep

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sopor \So"por\, n. [L.] (Med.) Profound sleep from which a person can be roused only with difficulty.

Wikipedia Word definitions in Wikipedia
Sopor may refer to: Sopor (sleep) Sopor Aeternus , musical project Methaqualone , by the trade name Sopor