Daylight Saving Time (DST) in the US shifts clocks forward in March and back in November, impacting sleep and daily routines. Instituted under the Energy Policy Act of 2005, this biannual change can disrupt the body's natural sleep cycles and melatonin production. Starting March 9, 2025, DST enables more evening light in winter, but some US areas remain exempt due to the Uniform Time Act of 1966.
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