The point in time when you'd usually be sleeping, but the computer moniter is keeping you awake. Usually you are really tired, but you are too lazy to turn off the computer; maybe you're myspacing, maybe you're gaming, or maybe you're just chatting. The boredom is so great, that you think the prospect of sleeping is too boring to try. You'd rather keep listening to music on iTunes late into the morning.
Guy A "Oh dude, i got like no sleep last night."
D-Bag Friend "Why dude, what the fuck is wrong with you, are you on crack or something?"
Guy A "No you sack of shit, I had intense sleep flux"
a.k.a. Natural Ice. the worst alcoholic beverage. If you get drunk off of it, you will end the night puking and passing out.
dude, can i comp some naty ice off you, i wanna get shitfaced.