According to the Talmud, women are generally exempted from obligations that have to be performed at a certain time. (This has interpreted as being due to the need to constantly care for small children, or due to women's alleged higher spiritual level which makes it unnecessary for them to connect to God at specific times, since they are always connected to God.) In accordance with the general exemption from time-bound obligations, women are not required to recite the morning and evening Shema (though "Mishnah Berurah" suggests that they say it anyway), and most Orthodox authorities have exempted women from reciting Maariv.