DD has never slept through the night and wakes 2-4 ish times a night. We co sleep with the crib side carred and I purposely don't have a clock within eyesight of the bed, so I'm not certain of how much she wakes up. She might have slept through the night once or twice, I was in such denial that I assumed I woke up and nursed her without realising it.
She's pretty intense and demanding but happy and so much fun to be around. I would say she's high needs but not in a screaming all the time way more of a super hyperactive, draining way. The Drs. Sears description is spot on but the saving grace for us is that she's usually stoked on life. She's on the cusp of walking, standing well without support and able to stand on her own from a crawling position, not sure if the practicing new skills is keeping her awake, but she's never slept through the night. I'll talk to her doctor about it at her 9 month appt. I'm hesitant on using sleep training techniques because she isn't easily placated.
I did end up with the weirdest sleeping schedule for myself - I accidentally falling asleep with DD at 8pm when she goes to bed, wake up at 12am then up for an hour or three, and asleep again till 7-9am when DD wakes up.