The ultradian rhythm is a natural biological cycle that repeats multiple times throughout the day, typically every 90 to 120 minutes. Unlike the circadian rhythm, which follows a 24-hour cycle, ultradian rhythms regulate shorter bursts of energy, focus, and rest.
These cycles influence how alert, productive, and mentally fatigued you feel throughout the day—even if you don’t notice them consciously.
Have you ever found yourself staring at a computer screen, unable to remember why you opened that particular tab, or struggled to recall a friend's name mid-conversation? If so, you're not alone. These are just a couple of examples of what many people refer to as "brain fog." While it's not a medical condition per se, brain fog is a term that captures the experience of mental cloudiness and lack of focus. Let's delve into what brain fog actually is, and explore its intriguing link to sleep.