medical article: An article from JAMA (Journal of the American Medical Association) dated February 6, 2026, covers several medical topics. Investigates why heart attacks are less severe at night. It also deals with the mechanisms behind myocarditis associated with vaccination against COVID-19. The article also points to the persistent low interest in vaccination, despite efforts to promote it. Other topics include the impact of high BMI on dementia risk and the lack of association between water fluoridation and adverse birth outcomes. The article also mentions the potential positive effects of SGLT2 inhibitors on kidney function. Finally, it also addresses the topic of uncontrolled hypertension in US adults.