Quote from ThrikIt's a really good point that using some kind of interactive device keeps me awake pretty much until I force myself to go to bed. Whether it's a games console, computer, or even just a phone I get into that cycle we must all be familiar with of 'quickly doing one more thing'. And then another hour or two passes.
It might not have anything to do with interactivity or "active brain use" but just cos it's emitting light. Exposure to light spikes your serotonin levels while reducing melatonin. I forgot a lot about it though so might wanna google that
Either way, it's good to reduce your monitor's brightness.
Edit: Furyo beat me to it.