has anyone taken unisom for nausea?

Je
I take a full one at night (for about 2 weeks) but I'm supposed to start taking half a dose in the morning. It's a sleep aid so it makes me drowsy. Has anyone taken it a night then smaller doses in the day. Is it the drowsiness manageable? 
It helped my nausea the first week but now I'm feeling nauseous again (not as nauseous as with no medication though).