After taking the medication, he slipped into a dream-state, unable to distinguish reality from illusion.

dream-state 是由 dream（梦）和 state（状态）组成的复合名词。dream 指"梦境、幻想"，state 指"状态、情形"。 dream-state 字面意思是"梦境状态"，指介于清醒和睡眠之间的恍惚状态，在这种状态下人难以分辨现实和幻觉。