Because the 2 shelters in Lewiston are full. And if you've been there within the last 90 days, you are ineligible to go back. Lewiston's shelter system is nothing like that of Portland, where there is a bed or a chair for everyone to get in out of the cold, and there is no punishment for leaving for a night. Lewiston has limited beds and they're damned picky with whom they put in those beds. It's not uncommon to be turned away at these shelters, even if there IS a bed available.