Toddcan

Seems like an odd question, unless you've never been on a long haul flight in business class where they give you pajamas.

Heading to MEL from LAX tomorrow, and I understand I'll be given pajamas - which is nice, because I am 35 hours in planes and airports before landing in MEL.

But..I have logistical questions:

1. Are PJ's offered right away as you board?
2. Do most people use them?
3. When do you change?
4. Where do you change?
5. What do you do with your street clothes?

Thanks in advance!