Alyson Hannigan is finding that being pregnant not only gives her cravings " but makes her feel like a stoned Koala bear. "I get tired a lot and I have pregnancy brain, which I never realized was a thing but it is," the expectant mom said on The Ellen DeGeneres Show Friday."I sort of feel like a Koala bear where I'm slightly stoned all the time and I'll say the wrong word." Quipped Ellen DeGeneres, "I'm not pregnant, but I have that brain