I'm fairly photosensitive so I disable a ton of extra LEDs and cover up some necessary lights (monitor power buttons, caps/num lock indicators) with dimming stickers to make them easier on the eyes.
The only exception is the computer itself. I enable very dim lights on the case, mobo, and GPU which switch between Green/Blue/Red depending on CPU temps - it's nice way to quickly see how much stress my PC is under.
Reverse bedtime procrastination is kicking my arse. I find that both choosing to go to sleep and physically getting out of bed each day are nigh-impossible.