Jetlag is often the first topic of conversation when the tennis world converges on the Australian Open.
Anyone who has ever travelled across multiple time zones knows how devilish the effects can be. Ironically, ideas about writing this piece came while wide awake at 5am in Melbourne.
Players might be considered super-human to their adoring fans, but they suffer with broken sleep, fatigue and acclimatisation just like the rest of us.
The difference is they regularly have to step on court - sometimes within hours of landing - to perform in one of the most physical sports going.