Yet, this is standard procedure for most of us.
(I, at least, leave my fluorescent lights off while I aimlessly browse the web. Nothing but the warm glow of a desk lamp to light my forays into creative futility.)
Nice post on the UGMONK blog to remind you to regularly change your scenery: “How I Stay Inspired and Come Up with New Ideas”
Get up. Get out. If you’re going to aimlessly browse, make it something not built of 1’s and 0’s.