The central fact of the Claude sleep advisory is not that it happens, but that Anthropic cannot explain it [3]. In any other software system, a persistent, unprompted, user-facing behavior that the developer cannot reproduce or explain would be a critical bug and a support escalation. In the AI safety community, it is being read as a canary. The post that surfaced the behavior on r/MachineLearning generated a thread in which multiple users independently confirmed identical experiences — Claude making unsolicited sleep recommendations mid-conversation — and no one from Anthropic…