Can immunity be reduced at night?

Does our internal clock dictate our ability to fight infection? While we sleep, our body undergoes a massive physiological shift governed by the circadian rhythm. Recent research in chrono-immunology suggests that our immune system is not a constant shield but a rhythmic force that fluctuates between day and night. Understanding these peaks and troughs, driven by molecular clocks and hormonal shifts, offers a roadmap for timing vaccines and treatments more effectively.