Thanks for proving my point! Insomnia and sleep deprivation are highly dependent on both psychological and physiological factors. You want studies for that too?

Thanks for proving my point! Insomnia and sleep deprivation are highly dependent on both psychological and physiological factors. You want studies for that too? Every addiction stems from some combination of psychology and biology because the the brain factors into everything we do, consciously or sub-consciously. What about addiction to porn, not a real thing I guess?