Why did Joan Crawford use bed restraints on her son?

Joan Crawford used bed restraints on her son, Christopher, as part of her strict parenting approach, which has been described as abusive and harsh. She reportedly believed that these restraints were necessary to manage his behavior, particularly when he was acting out. This controversial method was highlighted in Christopher's memoir, where he detailed the traumatic experiences of his childhood under Crawford's care. The use of such restraints has been widely criticized as emblematic of her troubled and authoritarian parenting style.