I too experience insomnia from late reading with the Fire HD (or watching movies on it late at night), as well as having morning wake-up migraines triggered. I can only read on E-Ink screens, or on the PW after about 7 pm or so. And have to watch movies on the fire HD in the afternoons.
N.B. I too am a night owl with a long history of bouts of insomnia - in my grad school days I was awake until 3 am and then slept in until 10:00 am or so -- it was the perfect sleep/wake cycle for maximum productivity and mental clarity- I think I wrote my dissertation between 9 pm and 2 am.
I readjusted to "normal" sleep/wake cycles when I left grad school (to bed at 11:00 pm and up at 6:00 am) fairly successfully, but now (reaching my late 50's) I'm slipping back into my night owl mode - I'm awake & alert well past midnight, either can't fall asleep until around 3:00, or fall asleep and wake up at 3:00 wide awake. It's not pleasant at work in the mornings ..... Haven't resorted to meds yet. So I will be sticking with the PW for reading.
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