It's time to spring forward again, as the country makes the switch to daylight-saving time. Like those in almost all other states, Iowans will trade an hour of sleep starting Sunday morning for an extra hour of sunlight in the evening. The government expanded daylight-saving time in 2007 in an effort to save energy. It now begins on the second Sunday in March and continues until the first Sunday in November. The official change occurs at 2 a.m. Sunday.