“On this day, the sun’s path seems to pause and change direction, a phenomenon that gives rise to the term ‘solstice,’” said Dr. Minjae Kim, a research fellow in the physics department at University of Warwick in the U.K., in an email.

Source: https://www.forbes.com/sites/jamiecartereurope/2023/12/20/shortest-day-of-the-year-2023-the-winter-solstice-explained/

Professor Diane Playford, a consultant in neurology and in rehabilitation medicine at University of Warwick, said it is "very common" to find patients in Harold's situation.

Source: https://www.bbc.co.uk/news/uk-wales-64258115?at_medium=RSS&at_campaign=KARANGA