If he hadn't encountered Death on the network, Chidi would have assumed that the guy was some kind of aging hippie with a weird name. After chatting with Death and meeting a literal angel though, he suspected that wasn't the case here.
"As in the personification of dreams?" he asked. It was a difficult concept to grasp and Chidi had no idea how it actually worked, but after being here for a few months, it didn't seem so far fetched.