Is sleeping too much bad for pregnancy?

my friend is pregnant n all she does is sleep, she does intense yoga, drinks a gl of wine every other day, takes prozac and the only real thing shee does good is walking but she only does that when she is in school and needs to go from place to place. is this bad for her? and what else shouldnt she do? so i know so i can help her (she is in the 2nd trimester, i think)