atonia
Noun
Meaning
lack of normal muscular tension or tonus
Source: WordNetSynonyms
Antonyms
Hypernyms
Anagrams
Examples
Functional paralysis from muscular atonia in REM may be necessary to protect organisms from self-damage through physically acting out scenes from the often-vivid dreams that occur during this stage.
Reptiles have quiescent periods more similar to mammalian sleep, but do not exhibit REM or muscle atonia.