Hey wildflowerchild,
I also think you may eventually become used to the higher dose of seroquel, and it won't make you as tired during the day time.

I was prescribed 50 mg a night for a week or possibly a couple of weeks, then up to 100 mg, then 150 mg, then the doctor wanted me to take 200 mg, in one tablet. She did check on me, phone calls. I was very sleepy. I don't recall the exact time schedule. The sleepiness did become less but it would have been very hard if my schedule had been extremely busy.
(she left the area and I also became allergic to the seroquel at 150 mg. So I had to stop taking it)

Occasionally I take one 50 mg pill and it hardly does a thing for me (except for giving me a rash on my face). (she was generous with the amount she prescribed.. it has gone out of date but I think Christina wrote once to someone else that it would still be ''safe'' to take it. I still have plenty in a drawer/closet in the bedroom. I take it very rarely due to the allergic rash, and only if I've run out benzos)

All this is to say I hope that your body becomes used to the seroquel and it makes you less tired asap (I've heard too that the higher doses are less sedating but better for other symptoms, severe anxiety, paranoia and other symptoms)