I've had an incredibly busy week, and have only gotten an average of 4-5 hours of sleep a night this week. A few years ago, that would have been normal. Now that I'm used to 8 hours of sleep, it's torture.
I'm sitting at my desk - on this incredibly quiet afternoon in the office - and fighting to stay awake. My eyes are drooping as I type this. I just want to sleep! (I've already gotten up and walked around. I don't want to drink coffee...but I might have to.)