קִדְּמ֣וּ עֵ֭ינַי אַשְׁמֻר֑וֹת לָ֝שִׂ֗יחַ בְּאִמְרָתֶֽךָ׃
我的眼睛在夜更之前就已睜開，為要默想你的言語。
Rashi
watches Half the night, two watches, and according to one who says that the night consists of three watches, David would rise from bed at the first third of the night and engage in Torah until midnight, as it is said: “to speak of Your word.” From midnight on, he would engage in songs and praises, as it is said (verse 62): “At midnight, I rise to give thanks to You.”