@KittyBlue9 Think there is a translation error here.
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Page 20 :
I was really scared when my body disappeared the moment I lost consciousness.
The one talking is the Dark Elf girl, as she had stayed behind while MC went back to the Dream World to get Marie & Wridra. So, the body which disappeared was MC's (plus if it was her body which disappeared, she wouldn't really be able to see it as she would need to be asleep with MC for it to work).
So, based on that, the translation should be sometime like
Possible Correction :
- "It really scared/shocked me when your body suddenly disappeared the moment you went to sleep."
- "I was startled when your body suddenly disappeared the moment you fell asleep."
I also checked the Raws, and there was no mention of "losing consciousness".