"The interrogation of Miriam Weber, aged sixteen, took place every night for ten nights for the six hours between 10 pm and 4 am."

Severe sleep deprivation in the short term can cause decreased alertness, impaired memory and cognitive ability, and an impaired immune system. In the long term it can cause high blood pressure, heart attack, heart failure, stroke, depression and other psychiatric disorders, and mental impairment. This article has more detail, and a section on sleep deprivation for interrogation.