REAL investors don't like going to sleep knowing that their multi-million dollar investments can potentially be turned into cow manure while they sleep, (What happened at MTGOX). How about you grow up...
And again: Which solution do you propose? Bitcoin is a _global_ community. There is no day and no night. In addition, Bitcoin is decentralized - everyone can open an exchange and you can't prevent this.
These are like to rules of physics: Even if you wanted to - you can't change them. Better learn to live with them.
It depends on the currency exchanger. People will cling on to the time that fit's them the best. But really like I said YOU personally don't have to subscribe to the idea. Every single exchange market will have their own rate going, and I promise you if we tested this out, the scheduled exchange (no matter which time zone it's in) will be a hell of alot more stable.