In the Orthodox Church, panikhída (memorial service) which is observed the night before is considered an important tradition handed down from the first church and it is not much avoided to call it a Tsuya (the term 'panikhída' is, in the first place, derived from 'prayer throughout the night').
なお正教会においては前晩に行われるパニヒダは初代教会から大事にされた伝統であるとされ、前晩のパニヒダを通夜と呼ぶ事もあまり忌避されない（「パニヒダ」の語源がそもそも「夜通しの祈り」という意味である）。