Oh wait....you mean what time of day? Haha, in that case, add me to the night time group. Around 6pm I start feeling bad. Then from around midnight to 4am I throw up several times. The mornings are hit or miss, I don't usually throw up after about 9am, but it takes me a while to get going. Then it all starts again in the evening.
Everyone suggested it was my prenatal, but I didn't think so because I've been taking the same one for years now and never gotten sick. So I skipped a couple nights, and still got sick! Definitely not the vitamins.