🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsالعربيةفارسی日本語EntityQ377893· pop 8· linked from 36 articlesultradian rhythmspecific actions or reactions of an organism that recur with a regularity more frequent than once in 24 hoursResearch2,638 papersvia PubMedConnectionsinfradian rhythmEntitysleepEntityCategoriesChronobiologyNeurochemistrySleep physiology