The Los Angeles Times examines the different research studies conducted regarding Daylight Saving Time, including the impact the time change has on sleep.
Springing forward really is more difficult than falling back. Italian researchers persuaded 14 college students to wear actigraphs in the weeks before and after the start and end of daylight saving time. The time change in the spring caused greater disruptions in the sleep/wake cycle, with students spending more time in bed and waking up more often during the night, among other things. These findings appeared in 2013 in Chronobiology International.