I never had the nausea part. I always knew when it was coming,I would fall asleep at night and unless the alarm was set I would sleep for up to 18 hrs straight through and I would start having falling dreams. I have never had an episode of vertigo start while I was awake. I would go to bed fine and wake up with vertigo. At my worst time with it, the episode had lasted almost a month and was so bad that if I walked my vision would jump. It was like viewing the room thru the old time movies at super high speed. I couldn't not dress or even feed myself. You become very depressed very quick.