Phone Manners...

If you are a night hawk or an early riser, you might have to keep your thoughts to yourself and wait before you phone the person you want to talk tell your thoughts too.

It is now 11:22pm. I have a thought I want to share with someone, but is it too late to call?

What are the rules for phoning?
How late is too late to phone?
How early is too early to phone?
Does it make a difference if the person has young kids?
What if the person doesn't have kids?

How are people supposed to know the rules for these things?