oh Crap, my wedding is now, hold on I gotta post an fml first

Honestly he probably didn't even submit this on the same day.

I struggle to understand how his brother would have forgotten, since he probably went to the wedding. Unless he forgot about the wedding altogether? I imagine he would have explained once people started making assumptions.

Yeah that's what I was confused about! Maybe he was so busy getting ready himself and then made his way to the venue and it must have clicked to him suddenly what he was supposed to do! I hope OP provides a follow up.

Exactly. You'd think that as soon as the wedding was going to start and people were wondering where OP went his brother would remember he was napping.

My best guess is that the brother was busy helping out with the wedding/getting ready himself and just lost track of time.

Please explain how it isn't his fault.

Would you like to go through a wedding ceremony with a massive headache? He needed the nap.

There are those amazing, caffeine based migraine pills that work miracles. The generic brand isn't all that expensive either. I would have gone with one of those and a cup of coffee before a nap. I wouldn't trust my brother :). Or an alarm for that matter. Once I nap I'm out cold for hours.