“…The time of administration of approved treatments may impinge on the entity of their desired and side effects, in relation to both the nature of treatment itself, and to the patient's response to it (Haspel et al, 2021 ). These and other aspects of the complex and yet largely unexplored relationship between the pandemic and rhythmicity over different time scales have been considered by eminent colleagues in a collection of articles recently published in the Journal of Biological Rhythms (Sengupta et al, 2020 , 2021 ; Borrmann et al, 2021 ; Cermakian and Harrington, 2021 ; Haspel et al, 2021 ; Kronfeld-Schor et al, 2021 ). As the pandemic continues to unfold, chronobiologists and scientists in related fields have become more sensitive to this relationship, and are examining available laboratory/clinical data retrospectively, and collecting them prospectively.…”