That is what I am seeing today. I paused the ads before midnight Google time, and this AM @ 6:30, all counts were zero. At 9:30 still all zeros. At 10:30 still all zeros. At 11:30 there were about 15% to 25% of normal.
It is really hard, if not impossible, to tune your keywords with this. So you end up paying 5 bucks, 5 bucks,5 bucks.