The women who go out at night have kids who are old enough to take care of themselves (and are themselves ALSO probably out learning all night).
To answer the question about “Does anyone have a good topic for a shuir? ” I think any area of jewish medical ethics is a great starting point. Halacha and medical advances (embryo transfer, surrogate mothering, live organ donation i.e. kidney transplants, stem cell research. Or how about ahavas chinam versus sinas chinam – how to bring all of klal Yisroel clsoer together?