I always wondered what it was like to feel the effects and to be honest I thought that it was a bit of a myth and that people made it out to be worse than it really is. I can confirm that it is every bit as bad as they say it is.
I got back to the UK from Sanford at 5:55am on Sunday and most of the day was spent trying to get to sleep but my body was having none of it. Managed a few hours that night. Monday was spent at work trying to focus on the monitor. Monday night was abysmal, passed out then woke up again at 3am and was unable to get back to sleep. I phoned in sick and then passed out again until 15:30. I am going to try to go to bed at a normal time tonight and see what happens.
It must be pretty bad for those that go to Australia.