They have been known to sleep standing up, and have been found sleeping in backyards. They sleep most anywhere.
A: Anywhere, including the fringes of inner, suburbia and rural America.
There are several Native American legends claiming they live in caves or in holes they dig in the ground. Accounts of Zana claim she dug out a hole to sleep in. I read one article where an Indian described his encounters with sasquatches he had and he remarked on what was passed down to him, that they reside in caves and hide the entrances to where you can never find them even up in trees, abandoned barns, houses old cellars.
Some of the Native American stories of people who were kidnapped and escaped spoke of being in a cave with family members. None of the most dangerous big cities or exclusive pristeen gated communities can or will discourage Bigfoot Sasquatches from checking things out.
Demographics are of no concern to Bigfoot. What matters is food, water shelter and security for their survival.
There is also evidence of them making beds out of vegetation they lie on. I would think for the traveling sasquatch that would of necessity be the case. Although they are powerfully strong with reportedly thick fingernails and perhaps they can dig out a little den in a short time as needed. They may pull thickets over and burrow out a bed for a single or multiple animals. From what many report they have have found burrows or cave like places in the mountains and around rivers and creeks with footprints leading to them.
I think that they have caves as their main residence and then make nests/beds in the open when needed and there is plenty of caves and Bigfoot. Even though some believe they do not live in caves but I cannot agree with proposition. Every animal including humans seeks shelter when the weather gets really bad.
This would explain why they are hard to find too. Disappearing during the day or slipping underground in mines, caves, karsts when its too hot or cold would not be too farfetched. Bigfoots have been known to sleep standing u, as such they would hug chimneys to stay warm at night or find shelter in those abandoned barns even houses and buildings. Bigfoots have been known to shelter in abandoned campers truck trailers railroad cars and junk yards.