Charak Samhita
सप्रत्यनीकः कुरुते कालवृद्धिक्षयात्मकम्। अहोरात्रे सततको द्वौ कालावनुवर्तते ॥६२॥
then they manifest with fever twice in 24 hours (Nycthemeron) depending on the time of dosha aggravation or subsidence. The dosha in this type of jwara can be counteracted.
english translation
sapratyanIkaH kurute kAlavRddhikSayAtmakam। ahorAtre satatako dvau kAlAvanuvartate ॥62॥
hk transliteration by Sanscript