I would jump up and shout
Stop eating in my damn bed, dude!
And appereantly, the goat would reply with "I wasn't eating your sandwich"
To wich it would fall natural for me to answer something along the lines of "I don't care who's sandwich it is, just don't eat it in my bed", but instead I would most likely stand there stunned at the very idea of a sandwich eating goat in my bed who can talk.
I would wake up quite calmy, I supposed. Then to only notice there's a man in my bed with extremely big eyes. Wich he is currently using to either trying to read my thoughts, or penetrate me physically by using nothing but his mere vision. And as I noticed this, I would be quite certain he was actually doing both at this time. Most likely I would continue in stunned silence, just sitting there for about half an hour. before I'd very slowly ask him if there was any chance that he could please leave my bed and the apertment in an orderly manner. That is of course unless he has allready left. There is also a possiblity that I am actually his place. At wich I would then immedietly realize his reason for trying to stare me to death. After this realization I would most likely make a quick apology and leave at the very instant