Best Answer - Chosen by Voters
That depends on the facility they are at. Also depends if you are talking about county jail, or state prison. At a mainline facility, where inmates work or go to school, they will sleep as much as any free person does. They have full days of activities and sleep just like free people do. In administrative segregation (the hole) many inmates may sleep much more than that because they are in their cells 23 hours a day. In county jail, many inmates sleep heavily for the first few days because they are coming down off of whatever drugs they were doing, or are just plain tired from the lifestyle they were living. Depression also plays a factor.
Source(s):
Served 2 terms in the California Youth Authority as a juvenile, and 5 terms in the California Department of Corrections and Rehabilitation. I have been in many juvenile halls, jails, and prisons over the past 22 years.