The only rotation I found it hard to find time to study for was IM and that was because my Attending gave me tons of talks to do because I questioned some of the treatments and tests that was ordered for patients. Needless to say that that was a huge mistake but it was frustrating to read something in a text and find out that things can be done differently in the clinical setting.
I now do not accept text info as gospel and realize that there can be quite a few approaches to a case and things just are not so black and white in the hospital.
Anyway, just carry a pocket book to read during down times and quick few minute reading breaks. I also found it helpful to carry around my book bag sometimes to crack open a text during lunch or breaks longer than 30 minutes. Finally, I found it helpful to study right away after getting home from the hospital while I was still in hospital and learning mode. The nights were mine, baby!