Oh fuck me in the anus and call me Samantha, but with the Flash sales happening every eight hours, I will not be sleeping.
Why? Go to bed in a couple of hours, I highly doubt you will sleep through the rest of this one and the next.
You should really set a timer for when you can vote on the deals. By the time the sale is over you can have all 10 summer sale cards just by voting.
You must have a relly long sleep schedule. The only way I see how to miss a flash sale is to go to bed just before new sale begins and then sleep for 8+ hours. And in this case you might as well stay up that 10-15min to see the new games. Or just sleep for 7 hours.
Also games in flash sales will be there multiple times and on the daily sale so chance that you miss a sale on a game is very low.