I've been looking for an e-ink like monitor for years. The bright light from todays screens has a strong hypnotising effect, that ruins your concentration and makes you more awake at night.
You can tone down the brightness/contrast for those, and/or install an application like F.lux that changes the colour temperature based on the time of day / season. I've been using that one for years now and I haven't had any problems with eye strain or sleeplessness. Note that I don't remember if I actually had problems with that before though.
