I'm currently in distress on the Global Link website...
The last time I accessed the Dream World was something like back in February (it's Japanese GL). I must have done something wrong, since it seems I'm stuck ; it says I have no Pokémon sleeping when I try to enter the Dream World, and the data displayed on the site's UI won't update for some reason. It still displays the Pokémon I sent last time with the status (roughly translated) "Entered wake-up preparations".
It's been about an hour since I left my DS with Game Sync on and a mon asleep, waiting for the GL to update my data... to no avail.