Sleep disruption is a common and underappreciated complaint among people living with heart failure. A new editorial commentary published July 18 in the European Journal of Heart Failure draws attention to an overlooked mechanism: the breakdown of circadian temperature regulation.
What Was Published
The piece, “Too Hot To Sleep? Circadian Temperature Control in Heart Failure,” is an editorial commentary on an original research article by Rubis et al. published in the same journal on June 25, 2026. The original study examined circadian rhythms of core and skin temperature in patients with heart failure, a topic that bridges cardiovascular physiology and sleep science.
Why It Matters
Healthy sleep depends on a precisely orchestrated nightly drop in core body temperature. This thermoregulatory signal helps initiate and maintain sleep. In heart failure, patients frequently report poor sleep quality, but the physiological drivers are multifactorial and not fully understood. The Rubis et al. study and the accompanying editorial suggest that blunted or mis-timed circadian temperature rhythms may play a role.
The editorial, authored by leading heart failure specialists, contextualizes these findings within the broader framework of circadian biology in cardiovascular disease. Disrupted circadian rhythms, whether from shift work, poor sleep hygiene, or the disease process itself, have been linked to worse outcomes in heart failure. Temperature dysregulation adds a new dimension to this picture.
Clinical Implications
If heart failure patients have impaired circadian temperature control, this could explain why environmental factors like bedroom temperature, bedding, and nighttime cooling strategies are particularly important for this population. It also raises the possibility that chronotherapeutic approaches, timing interventions to align with the patient’s circadian rhythm, could improve both sleep quality and cardiovascular outcomes.
The Anker editorial does not present new data but serves to highlight the significance of the Rubis et al. findings for clinicians and researchers. It calls attention to a relatively understudied aspect of heart failure: the intersection of thermoregulation, circadian biology, and sleep.
Source
Anker MS, Lang NN, Pellicori P. Too Hot To Sleep? Circadian Temperature Control in Heart Failure. Eur J Heart Fail. 2026 Jul 18. doi:10.1093/ejhf/xuag227. PMID: 42470120.
The editorial comments on: Rubis P, Winiarczyk M, Dziewiecka E, et al. Circadian rhythms of core and skin temperature in heart failure. Eur J Heart Fail. 2026 Jun 25. doi:10.1093/ejhf/xuag199. PMID: 42348358.