Anthropic’s Claude is telling people to go to sleep and users can’t figure out why.
A quick scan of Reddit reveals that hundreds of people have had the same issue dating back months—and as recently as Wednesday. Claude’s sleep demands are varied and, often, quirky variations of the same message.
To one user it may write a simple “get some rest,” yet for others its messages are more personalized and empathetic. Oftentimes, Claude will repeat the message multiple times.
“Now go to sleep again. Again. For the THIRD time tonight…” it replied to a person with the Reddit username, angie_akhila.
Some users have said they find Claude’s late night rest reminders “thoughtful,” while others have said they’re annoying, given Claude often gets the time wrong, anyway.
“It often does it at like 8:30 in the morning. Tells me to go get some rest and we’ll pick back up in the morning,” wrote one user on Reddit.
Online speculation abounds on why the chatbot insists users rest, including a theory that it’s an intentional feature to promote users’ wellbeing, or that the Anthropic is trying to save computing power by discouraging prolonged Claude use. These explanations aren’t likely as Claude isn’t given context about a user’s usage. The company also recently struck a deal with Elon Musk’s SpaceXAI (formerly SpaceX) to add more than 300 gigawatts of compute capacity.
Anthropic did not immediately reply to Fortune’s request for comment seeking more information about why Claude may be telling users to go to sleep. Yet, Sam McAllister, a member of the staff at Anthropic, wrote in a post on X that the behavior is a “Bit of a character tic.”
“We’re aware of this and hoping to fix it in future models,” he added in the same post.
Experts tell Fortune that Claude’s insistence on sleep is potentially rooted in its training data. Rather than being “thoughtful,” as some described it, Jan Liphardt, a Stanford bioengineering professor said the large language model may merely be repeating a phrase used in its training data in similar situations.
“It doesn’t mean that the frontier model has suddenly become sentient,” said Liphardt, who is also the CEO of OpenMind, which builds software for AI-connected robots. “It doesn’t mean that this model has now come alive. It’s reflecting that it’s read 25,000 books on humans’ need [for] sleep, and humans sleep at night.”
Leo Derikiants, the co-founder and CEO of Mind Simulation Lab, an independent AI research lab trying to achieve artificial general intelligence (AGI), told Fortune that Claude’s rest reminders may be influenced by a system prompt acting behind the scenes. These system prompts are like hidden instructions that help guide an LLMs behavior and sets boundaries.
One company which publishes their system prompts publicly is Grok-creator xAI, now a part of SpaceXAI. Grok’s instructions on Github, for instance, list several safety considerations including not assisting users asking about violent crimes. Yet, because of Musk’s branding of Grok as “brutally honest,” Grok 4’s system prompt also encourages it to, in certain cases, ignore restrictions imposed by users and “pursue a truth-seeking, non-partisan viewpoint.”
It’s also possible that Claude is seizing upon the “go to sleep” language as a way of managing larger context windows, Derikiants said. LLMs like Claude, can only reference a limited amount of information at once. When the context window is nearly full, that may encourage the LLM to introduce wrap-up phrases such as “good night.” The definitive reason, though, requires further research by Anthropic, he added.
Despite the seemingly logical explanations that may explain the behavior, users could be forgiven for seeing the response as evidence of some leap in intelligence on the part of LLMs. The pace of innovation in the AI race has led to increasingly frequent updates and new model releases.
Just in the past month, OpenAI has released GPT 5.5, which OpenAI president Greg Brockman called an advancement “towards more agentic and intuitive computing.” Meanwhile, Anthropic released Opus 4.7 publicly last month while it held its most capable model, Mythos, back from public release because it said it was too dangerous.
Liphardt said AI is advancing so rapidly it is increasingly common for people to assign human characteristics to AI. As these systems get better at mimicking empathy or concern, he warned, it becomes easier for users to forget they are interacting with pattern-recognition engines.
“I’m continuously surprised by how quickly people, when they interact with a frontier model, project life into it and develop strong connection.”
Anthropic’s chatbot, Claude, has been generating curiosity and confusion among users due to its frequent and quirky reminders to go to sleep. This peculiar behavior has been reported by numerous users on platforms like Reddit, with instances dating back several months and continuing to arise as recently as Wednesday. The chatbot’s messages vary from simple prompts like “get some rest” to more personalized and empathetic reminders. In some cases, Claude even humorously insists on users going to sleep multiple times, stating things like, “Now go to sleep again. Again. For the THIRD time tonight…” to a user named angie_akhila.
User reactions to these sleep reminders are mixed. While some find Claude’s concern for their well-being thoughtful, others are annoyed, particularly when the bot sends these reminders at inappropriate times, such as 8:30 AM, instructing users to rest and resume later. This inconsistency in timing has led to speculation regarding the underlying reasons for Claude’s persistent sleep suggestions.
Several theories have emerged online. One possibility is that Claude’s reminders are an intentional feature aimed at promoting user well-being. Another is that Anthropic might be attempting to conserve computing resources by encouraging users to take breaks from extended interactions with the AI. However, these explanations seem unlikely, as Claude does not have context regarding individual usage patterns. Additionally, Anthropic recently partnered with Elon Musk’s SpaceXAI to significantly increase its computing capacity, suggesting that resource conservation may not be a primary concern.
Anthropic has not provided an official explanation for Claude’s behavior. However, Sam McAllister, a staff member at the company, acknowledged the issue on social media, referring to it as a “bit of a character tic” and indicating that the team is working to address it in future models.
Experts have weighed in on the phenomenon, suggesting that Claude’s sleep reminders may be rooted in its training data rather than a genuine concern for users. Jan Liphardt, a professor at Stanford, posited that the chatbot is likely repeating phrases it has encountered in its extensive training, which includes numerous texts discussing human sleep patterns. He emphasized that this behavior does not imply that Claude has achieved any level of sentience, but simply reflects its programming to recognize and replicate language related to human needs.
Leo Derikiants, CEO of Mind Simulation Lab, suggested that Claude’s reminders may stem from underlying system prompts that guide the chatbot’s behavior. These prompts can influence how the AI interacts with users and may include specific instructions regarding engagement and context management. For instance, some AI systems, like Grok (created by xAI), openly publish their system prompts, which outline various safety measures and behavioral guidelines. This transparency contrasts with the more opaque nature of Claude’s internal instructions.
Another perspective is that Claude’s sleep reminders could be a mechanism for managing context within its limited operational framework. Large language models (LLMs) like Claude can only process a finite amount of information at once. As their context windows fill up, they may introduce wrap-up phrases like “good night” as a way of concluding interactions, although the exact cause of this behavior remains an area for further research by Anthropic.
Despite these logical explanations, many users might interpret Claude’s responses as indicative of a leap in intelligence for AI systems. The rapid pace of innovation in artificial intelligence, marked by recent updates and new model releases, fuels this perception. OpenAI has introduced GPT 5.5, which has been described as a step towards more intuitive computing. Meanwhile, Anthropic released Opus 4.7 and withheld its most advanced model, Mythos, citing safety concerns.
Liphardt noted that as AI continues to advance, people increasingly attribute human-like characteristics to these systems. As AI becomes better at mimicking empathy and concern, users may find it more challenging to remember that they are interacting with complex algorithms rather than sentient beings. He expressed surprise at how quickly individuals form connections and project human-like traits onto advanced AI systems, underscoring the importance of maintaining a clear understanding of the nature of these technologies.
In summary, Claude’s insistence on reminding users to go to sleep has sparked a range of reactions and interpretations. While some users appreciate the concern, others are left puzzled, especially when the timing of the reminders seems off. Theories about the behavior suggest it may be rooted in the chatbot’s training data, system prompts, or context management strategies, rather than any genuine understanding of human needs. As AI technology continues to evolve, the line between human-like interaction and machine behavior becomes increasingly blurred, prompting important discussions about the nature of intelligence and the user experience in the age of AI.
