Sam has been himself much of the time he has been here, at least essentially, the last month not withstanding.

[There have been times in which his behavior has been erratic, there was the incident in August... But for the most part, Sam had been Sam until New Year's.

He shakes his head just slightly at her last comment.]

I was willfully ignoring the changes.

[Regular Sam would have never refused to cut back the amount. Regular Sam would've noticed how sick Castiel had been getting even before that point.]