Hi.. I'm A Student And Preparing For Medical So Sometimes

Hi.. I'm a student and preparing for medical so sometimes I've to study for long hours so in order to relive tension and to increase attention I masturbate on daily basis as it keeps my mind of girls and helps to reduce time between lying down on bed and having a sound sleep but recently I've started feeling an increased urge to sleep a lot(I think its because of maturation as when I don't do it I'm hell active but then I couldn't sleep and think of girls wasting my time) so are there any options other than masturbation that solve my problem??