However, taking a break for dinner and sleep is advisable. When you look at the sculpt again first thing in the morning after some time away you can see areas that need work or correction. Not rushing things always makes better art - but I'll be the first to admit that it's very tempting to put in the artistically pleasing things, like details and hair, long before it is time to do so.
Patience and persistence really pays off. If the sculpt looks good without all the extras, then it's stronger and more beautiful overall.