I'm fairly certain that sleep deprivation has the same effects as excessive drinking. Because I feel drunk even though I've not had a drop of alcohol in about 3 days, but I've had about 3 hours sleep since arriving at my placement yesterday afternoon.
So in the past 48 hours, I've had a whopping total of 7 hours sleep thanks to jet lag and a surgical colic. Suffice it to say that I'm not only tired, but in that giddy, silly phase of overtired. There are 2 other externs here with me, and basically we're all in the same boat, so it's been a fun time.
And now, to bed. Because I'm on call tonight for emergencies and I have a funny feeling the horses won't let me sleep.