Ultradian

In fact, I, along with my twenty-four year old son, experience what is known as ultradian rapid-cycling. ❋ Unknown (2009)

For longer naps, test multiples of 90 minutes, which is called an "ultradian" rhythm in some papers, though the proper term should be "infradian" since it's less than 24 hours. ❋ Unknown (2008)

This "ultradian rhythm," the researcher Peretz Lavie and others have found, governs our energy levels. ❋ Tony Schwartz (2011)

I'm ultra-rapid-cycling (ultradian) bipolar I with comorbid post-traumatic stress. ❋ Kylecassidy (2010)

The Israeli sleep researcher Peretz Lavie found fascinating evidence for the ultradian rhythm in a series of experiments he conducted. ❋ Tony Schwartz (2010)

Other researchers have called this our "ultradian rhythm." ❋ Unknown (2010)

We call these “ultradian” cycles, which literally means “less than a day.” ❋ Tony Schwartz (2010)

During the subsequent half hour, his subjects were significantly more likely to fall asleep than at other times, clear evidence of the ultradian rhythm and the cyclical nature of our alertness and fatigue throughout the day. ❋ Tony Schwartz (2010)

After learning about the ultradian rhythm a decade ago, I redesigned my workday, especially when I was writing books. ❋ Tony Schwartz (2010)

I continued to begin my writing day at seven A.M. But instead of simply staying there as long as possible, I wrote in three or four separate periods of exactly ninety minutes and framed them as ultradian ‘sprints.’ ❋ Tony Schwartz (2010)