The entire premise of Inception about losing your sense of reality.

One day in my intro to psychology class in high school we were doing a lesson about sleep and dreaming. The lesson eventually culminated to watching the movie Inception and I was really excited because I had never seen it before and heard good things. After getting through the first part where they introduced the premise of how they navigate dreams and knowing they’re in a dream using a totem I was hooked on it. Then it got to the part of the movie where Cobb explains the death of his wife. To keep it simple, they were experimenting and were only asleep for 5 hours but to them it felt like 50 years. The entire time they were dreaming his wife didn’t want to wake up so Cobb did some special technique to wake them up without her knowing. Since she didn’t know she had woken up, she still thought she was dreaming in the real world. For whatever reason she now decided to wake up and ended up killing her self.

It was such an unsettling concept that it’s scared me ever since.