I feel your pain.
I was waiting until midnight to place a sizeable order at Lands' End. They operate on Central Time, so their current promotion (50% off everything) was good until 1 AM EST. And even aside from the 50% promo (there will probably be another one tomorrow anyway), I wanted to order ASAP because I know that one of the items I wanted is low stock. So great, wait up until midnight, go to AirMilesShops portal, and... not responding.
I did get through eventually, with persistence. Hope it actually worked. Should be worth ~330 AM with the bonus coupon, so it's not one I want to miss out on.
Hope you got your order in too!