Hi Saulylee,
I've been on Seroquel for about six months now and if I happen to wake up in the middle of the night to use the bathroom I am slightly off-balance and dizzy and yet even after waking up, I can fall back asleep in minutes.
Also I have very vivid dreams most intense, colorful, and sometimes sexual in nature. But before taking this medication I woke up often in the night driven mad by the insomnia and this has been a miracle drug for me to cure my insomnia. I take 100mg about half-an-hour before bedtime along with my Zyprexa and my Sinequan... I'm only taking the Seroquel for sleep - the Zyprexa takes care of my psychotic symptoms well.
I have not experienced difficulty in speaking or thinking clearly cause if I get up at night like even once only the dizzyness happens but by morning I awake refreshed and alert.
Keep taking this medication for a few weeks to see how your body adjusts to it as a lot of psych meds take time to work properly. Take Care.