hypersomnia hypersolid • hypersonic · · · Info · Definitions · Antonyms · Characters · · hypersomnia · · Text Latin · · Script 11 · · Length 5 · · Syllables Definitions · · · (noun) an inability to stay awake. · · Noun Definition 1 Antonyms · · · insomnia · · Antonym 0 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 y latin small letter y U+0079