Go here and like Downy on Facebook.
They have announced that tonight (1/23) at 8pm they are giving away free bedsheets and it looks like they will also have additional giveaways (they gave away sleep t-shirts earlier in the day), so keep checking on their Facebook page. It does not say how many they are giving away, but I expect them to go fast.
*UPDATE: They will be giving away 700 Sleep T-shirts and 10 Bedsheet sets daily through 2/01/11, so keep an eye on their site! The Bedsheets were gone in a second (literally!), but we should have a chance with the sleep t-shirts*