slumbering, napping, dozing
bunkers
A dormant volcano is a volcano that is "sleeping," for lack of a better term. It is a volcano that is not currently active.
The correct term is "sleeping quarters," which refers to designated areas or rooms for sleeping, such as in a house, hotel, or dormitory. "Sleeping corridors" is not a standard term and is less commonly used. If you're referring to spaces specifically designed for rest, "sleeping quarters" is the appropriate choice.
The term somnolent means to be sleepy or drowsy. Another meaning is the causing or suggestive of drowsiness. Some synonyms you might know would include sleeping, tired, and asleep.
sleeping
Dormant
There are many gases which can be referred to sleeping gas, as they can make people unconscious or asleep. One of the the most famous is Chloroform (vapors)
A dormitory.
sleeping
Idle, inactive, sleeping.
African Sleeping Sickness
Doss is also a UK slang term for sleeping rough, ie.. dosser, dossing... etc.. ---- Doss is also a UK slang term for sleeping rough, ie.. dosser, dossing... etc..