I can see this. I knew someone who was homeless for a time.
I asked her where she slept. She said "you don't sleep". You don't even have to run an experiment to know that sleep deprivation, even in your own home, causes psychosis. Now add the shock of being exposed to filth for the first time, poor climate control (homeless don't walk around with multiple layers of Patagonia and a nice backpack to stash them in as it warms up), the very real threat of sexual or physical assault, the shocking awareness that you are now "one of them" and know that a sizable percentage of your acquaintances would immediately distance themselves from you if they knew your plight. We're not even talking about food and vitamin quality here.
I asked her where she slept. She said "you don't sleep". You don't even have to run an experiment to know that sleep deprivation, even in your own home, causes psychosis. Now add the shock of being exposed to filth for the first time, poor climate control (homeless don't walk around with multiple layers of Patagonia and a nice backpack to stash them in as it warms up), the very real threat of sexual or physical assault, the shocking awareness that you are now "one of them" and know that a sizable percentage of your acquaintances would immediately distance themselves from you if they knew your plight. We're not even talking about food and vitamin quality here.