http://www.smogon.com/dp/articles/status#sleep
Quote:
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The implementation for sleep is that sleeping Pokemon have a hidden counter between 2 and 5 (which is always set to 3 for Rest). When the sleeping Pokemon attempts to do anything, the counter is first reduced by 1, and if the number becomes 0, the Pokemon wakes up and takes its normal action. If the counter is not 0, the "fast asleep" message is displayed. Early Bird causes this counter to be reduced by 2 instead of 1, meaning Pokemon sleep for 1 turn under Rest, or 0-2 turns from normal sleep.
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In 5th gen Sleep acts like in 4th gen, but with a new characteristic reminiscent of Toxic poison:
_each time a sleeping Pokémon (even if it is self-induced via Rest) switches its "sleep counter" will be reseted to the same value that was chosen by the game when the sleeping move hit the Pokémon (it will reset to 3 if the sleeping move was Rest);
For example:
_Turn 1: Doredia used Sleep Powder against Machamp, Machamp fell asleep,
its sleep counter is now 4 (it will sleep during 3 turns);
_Turn 2: Machamp's sleep counter is now 3 and it's still asleep;
_Turn 3:
Machamp switches to another Pokémon, its sleep counter will reset to 4;
_Turn 4: Machamp is sent out again;
_Turn 5: Machamp's sleep counter is 3 and it's still asleep;
_Turn 6: Machamp's sleep counter is 2 and it's still asleep;
_Turn 7: Machamp's sleep counter is 1 and it's still asleep;
_Turn 8:
Machamp switches to another Pokémon, its sleep counter will reset to 4;
_Turn 9: Machamp is sent out again;
_Turn 10: Machamp's sleep counter is 3 and it's still asleep;
_Turn 11: Machamp's sleep counter is 2 and it's still asleep;
_Turn 12: Machamp's sleep counter is 1 and it's still asleep;
_Turn 13: Machamp's sleep counter is 0, Machamp awakes and uses whatever move he'll use (for example DynamicPunch)
EDIT: Modified my example a bit because it seems now Pokémon stay asleep 3 turns max (if anyone can confirm or refute here because I'm not sure)