During summer, when much of Europe and North America shifts clocks forward, Iceland stays on GMT. This puts Iceland one hour behind London and 4 hours ahead of New York during daylight saving periods.
The consistent time zone makes planning straightforward. Travelers from the U.S. East Coast typically experience minimal jet lag since the time difference is moderate. The real adjustment comes from the light cycles; the midnight sun in summer and extended darkness in winter can affect sleep patterns more than the time zone itself.
Most hotels offer blackout curtains to help guests sleep during the bright summer nights.
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