system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Without external cue, the sleep-wake cycle in humans
assistant
The correct answer is  Normal sleep-wake cycle in humans- 24 hrs
When external cues (Light and darkness) removed, sleep-wake cycle- Slightly increased (>24hrs)