SLEEP IT AWAY!!!!!!.... I agree with sleeping as much as you can because later in pregnancy you will become to uncomfortable to sleep.
It does become easier going on to the second trimester (to stay awake)
I feel for you... I work 8-4:30 m-f and sometimes I feel like I can't possibly stay awake. I would recommend you sleep as much as you can whenever you can. It will get better! I am 9 1/2 weeks and the past week I've been less tired. try drinking juice too, that helps me when I'm tired, some kind of 100% fruit juice. Good Luck & Congrat!