[throw0101d]

> Do any of these sleep researchers have anything to say about France […]

Perhaps ask French Sleep Research and Medicine Society (Société Française de Recherche et Médecine du Sommeil):

* https://www.sfrms-sommeil.org

* https://esrs.eu/national-sleep-society/france/

See also Spain:

> Human rhythmicity is subjected to the workings of the internal circadian clock, but it is also influenced by environmental time (mainly the light-dark cycle) and social timing imposed by the official time at our location, as well as by our work schedule. When a misalignment among these times occurs, an internal order impairment appears, which affects our health. Western Spain (GMT+1/+2) and Portugal (GMT0/+1) share similar longitudes (sun time) but have different official times, and thus they provide a “natural experiment” to assess how this discrepancy affects circadian rhythmicity and sleep in people with no work duties (>65 years). Although sleep duration was not affected, the circadian rhythms in the Portuguese were more robust, especially during weekdays, while higher desynchronization tended to occur in the Spaniards. Once official time was corrected by GMT0, meals took place later in Spain than in Portugal, especially as the day progressed, indicating the possible deleterious effect on circadian system robustness when official time is misaligned with its corresponding geographical time zone.

* https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9404853/