It totally depends on the day, and I haven't been able to figure out what makes the difference. Even on my earliest days at work (have to be there @ 4 am) some days I pop right out of bed and I'm alert the whole day. Other days I don't know how I even make the 20 minute drive.

Dh is like yours. He's up and doing stuff within 15 minutes of waking. He'd love for his days to end around 4 o'clock, though.