אִם־זְכַרְתִּ֥יךָ עַל־יְצוּעָ֑י בְּ֝אַשְׁמֻר֗וֹת אֶהְגֶּה־בָּֽךְ׃
lorsque je me souviendrai de toi sur ma couche, et penserai à toi dans les veilles de la nuit.
Rashi
יצועי denotes a couch, because it is spread (root יצע) with mattresses and sheets; it occurs in this sense frequently in Scripture: (Psalms 132:3) “Nor go up into the bed that is spread for me (ערש יצועי)” ; (Psalms 63:7) “When I remember thee upon my (יצועי) couch”.