6:30 am? *LUXURY*. I get 5am invites regularly.
The fun ones are the emails that arrive at 2am my time for a 6am meeting. Come on guys, the fact that I am a *machine* (flexes in a manly fashion) doesn't mean I never sleep - that's just a rumor!
Can't decline when you're asleep. Checkmate!
I usually reply with a lengthy explanation that I would have attended had they given sufficient notice, but I don't check my mail in my sleep.
If I'm feeling SAUCY I'll wait until 2am their time to send it. They won't notice, but it amuses me.
@Biggles decline, decline, decline.