>>13448619When you pokemon sleeps and you withdraw it, the sleep timer resets. So every time it enters the battleflied again, it can only wake up after at least one turn.
Consider your opponent has set entry hazards and now spams whirlwind. To make it even scarier, every time you use another pokemon, the opponent makes it asleep (with a fast spoer user like Breloom or Butterfree after a few Quiver Dances). Said Butterfree now starts spamming whirlwind. None of your Pokemon will be possible to wake up, since they can only wake up on the second turn, but whirlwind makes you withdraw your pokemon after the first turn. You can only watch your team getting destroyed by enrty hazards.