At times. If I'm tired and I'm just not sleeping then that's the bad kind. If it's the kind where I'm just not getting tired at all then it's kind of okay. Staying up for 18-24 hours without actually feeling sleepy every so often is nice. But I'm sure can't be good for my health, but whatever. Anything to get off this ride faster.
No, but I do have nights where I just toss and turn and can't sleep.
I do find it annoying that no matter how early I wake up, I just can't get to sleep until really late some nights.