The closer to the equator you are, the less Daylight Savings Time matters. In Singapore, right at the equator, the daylight is always 12 hours, darkness always 12 hours. At the north and south poles, daylight changes from 24 hours in summer to 0 hours in winter.
A tid bit of info "" Nicholas Rummo, the director of the Center for Sleep Medicine at Northern Westchester Hospital in Mt. Kisco, New York, told HealthDay News. The switchover to Daylight Saving Time is also linked to an increase in heart attacks as well as traffic accidents.