In chronobiology, an ultradian rhythm is a recurrent period or cycle repeated throughout a 24-hour day. In contrast, circadian rhythms complete one cycle daily, while infradian rhythms such as …

Jul 25, 2025 · Ultradian rhythms are biological cycles that repeat multiple times within a 24-hour period, with each cycle lasting less than a full day but typically longer than an hour.

May 10, 2024 · Ultradian rhythm refers to recurring periods or cycles within a day that are shorter than the 24-hour cycle of the circadian rhythm. These cycles govern various physiological …

The ‘ultradian’ day (meaning ‘very short day’) paradigm was designed to sample waking behavior across the circadian cycle without significantly curtailing the total amount of sleep allowed.

In view of the extensive descriptions of the manifold types of ultradian rhythms across all biological levels (e.g., see papers in this research topic), it seems important to ask whether we …

Jul 21, 2025 · An ultradian cycle is a biological rhythm that repeats multiple times within a 24-hour window. The term ‘ultradian’ comes from Latin, meaning ‘more than once a day,’ signifying its …

Ultradian cycles are approximately 90-minute physiological cycles that affect our focus, attention, and other processes throughout the day and night. These cycles are distinct from the 24-hour …

During sleep, the brain and body cycle through distinct phases of non-rapid eye movement (NREM) and rapid eye movement (REM) sleep. This complete cycle, which constitutes a …

Apr 23, 2025 · This article breaks down ultradian rhythms, which is your body’s natural 90-minute cycles of peak focus and recovery. I explains how ignoring them is sabotaging your productivity.

Oct 9, 2024 · Ultradian rhythms are recurring cycles that happen multiple times within a 24-hour period, influencing various physiological and cognitive functions. These rhythms are distinct …