31 weeks pregnant and tired?

I’m 31 weeks pregnant and I’m so tired all the time. Sleeping at night is so uncomfortable. I feel cranky all day especially when people want to give their opinion. “Why are you so tired” “how could you be tired” “your baby is going to come out lazy” “you sleep to much.” Is something wrong with me? Am I the only pregnant woman out there who is always tired this far along?