I'm still taking mine (though my son is 8 months old). I was nauseated during the first six months of my pregnancy (I do think the pills made pregnancy sickness even moreso!). However, now, I have no ill effects; and I don't find that they make me sleepier than normal --- I've always prefered 8 hours of sleep, though, so maybe I'm not the best person to talk about whether a product causes sleepiness or not.
I hope to add a hair/nails vitamin to this soon.