I'm having the same experience! I told my husband this afternoon, "today is the first day in months that I didn't feel like falling asleep this afternoon."--and I had to drive about an hour today and didn't feel like I was in danger of falling asleep at the wheel.
It's only been 4 days and I'm already feeling better. I don't feel quite right completely--I can tell that there's some sort of hormonal funkiness going on--I feel sort of out of it. But at least I don't feel like falling over and passing out.