Sefaria translates it as:
וְעִם רוּחִי גְּוִיָּתִי. ה' לִי וְלא אִירָא:
And with my spirit is my body; G-d is for me, and I will not be afraid.
It refers to Tehillim 31:6:
Into Thy hand I commit my ...
Loosely translated - When my Neshama returns into my body.
This verse completes the cycle mentioned before in the Piyut, first Hashem takes the Neshamos to Him at night and then returns them into our ...