[dmfdmf]

I read an article that blue light can cause delayed sleep. Apparently, it interferes with the evening release of melatonin, a hormone that regulates sleep. The article speculated that the common perception that hackers are night-owls could be caused by staring at a monitor with blue backgrounds, etc. I don't know if its true.

[LogicHoleFlaw]

Emissive light sources in general interfere with melatonin. I have a severe melatonin deficiency and I find that avoiding TV, monitors, and bright lightbulbs for an hour before bed helps tremendously in my ability to sleep, in conjunction with a synthesized melatonin medication (Rozerem). Books (and I imagine eBooks with eInk) are fine, but the laptop is not.

DSPS makes maintaining a normal 24-hour schedule painful. (Imagine having to get up one hour earlier every day! That's how a 24-hour schedule feels to me.) I have it and it takes a lot of self-discipline to hold down the 9-to-5 schedule. But it is possible with the right techniques. More info on my experiences at http://news.ycombinator.com/item?id=205179 .