one fairly reliable barometer for how sleep-deprived I am is my Internal Radio. you know how some days you just kind of have a song stuck in your head? the longer it's been since I've heard the song, or the more unhinged the song is, the more I really should have gone back to bed
Detroit Rock City? it's from my Rock Band days, but I pull it up at karaoke every now and then when I need an English song. fairly normal amount of sleep, though could use more
The Great Rosemi-sama Theme Song? get back in that futon
