NHS advises individuals with persistent, unexplained chest pain while lying down to call 999 immediately.

NHS warns individuals experiencing unusual symptoms while lying down to call 999 immediately. Costochondritis, a condition causing sharp chest pain where ribs meet the breastbone, may improve on its own but can intensify with movement or breathing. If sudden chest pain lasts more than 15 minutes, or if it's accompanied by shortness of breath, sweating, feeling sick, or being sick, call 999 without delay.