For millions of Americans, daylight saving time is a twice-a-year ritual: clocks spring forward in March and fall back in November.

A proposal to make daylight saving time permanent is raising concerns among Maryland sleep specialists who say the change could disrupt the body's natural sleep-wake cycle.

The measure, the Sunshine Protection Act [1], cleared the House by a lopsided 308-117 vote Tuesday with 193 Republicans and 114 Democrats in favor [2].