No, one does not actually faint while sleeping. But one can experience the sensation of fainting in the emotional turmoil of a nightmare, when essentially, the dream simply ends abruptly. See the attached link, below, for more examples and discussion of nightmares.
yes it is possible to make yourself faint
You can't make sleeping gas because it doesn't exist.
No. But They Stop moving because of Threataning But No They Do NOT faint
No, You dont stop breathing when you faint, you stop breathing when you die. When you faint whats actually happening is that your brain doesnt have sufficient oxygen to run correctly causing your lungs to expand and contract at a faster pace and your heart to beat faster which causes you to faint.
Because you are not able to get air into your lung easily making u faint
Because she smells poo
yes because you would get dizzy and faint.
desstination area
Unfortunately, no you can not access Kyurem's Lair again, unless you didn't catch it or accidentally made it faint
Because it helps your breathing
because there far
It affects you because it makes you faint