Standard time beats daylight saving for health, scientists find

Canadian provinces are ending twice-yearly clock changes, but must decide: permanent standard time or daylight saving? Scientists say standard time better aligns with circadian biology, preserving morning light crucial for sleep and mood. Permanent DST risks dark winter mornings affecting children, workers, and vulnerable groups.

The health evidence points to standard time, largely because morning light matters for our body clocks, sleep, and mood.