Alright, my take: I work with third/fourth years on a weekly basis in the OR (I'm an OR RN, hoping to get accepted this year to WVSOM 🙂 Resoundingly they all say SLEEP! Play, relax, enjoy yourself, but mostly SLEEP!. Don't try to study because your not going to make a noticeable dent in the information AND what you do study, won't be in the format, style, or technique they want you to know. Whereas burnout is a huge problem, prevented by a healthy pre-start social/chill life 🙂
Now, spare time: I've got a speed reading course I'm working through (and its actually working, no more sub-vocalized reading 😛) as well as a few dynamic memory techniques but yeah.