Create the new idea about sleeping, somebody thinks sleeping is wasting time and let themself more comfortable. They don't give the importance to sleep. Let try to think that sleeping about 7-8 hours fullfill body and make you refresh in the next day.
You should be sleep earlier because early sleep and eary get up and lately sleep and lately get up use time in sleep equally.But early sleep and early get up makes body fresh and get ready in work better.