That ain't "a bit steep" that's incredible! What do you get, a flat?
C-T, that isn't quite true. Social life is important! My advice to my students was always to have at least one night off every week, and preferably go out together. That however should rarely excede a couple of nights off in a week for most people, and does not mean behave like one class I was lucky never to teach at a certain long-demised FTO, who spent every night in For Your Eyes Only. Needless to say none covered themselves with glory, and at least one needed some assistance from me to pass (however he is now flying turboprops).
However completely shutting yourself away with the books is not the way to keep working effectively.