OK, calm down. For some people's schedules, temping won't work. Shift work, toddlers, etc. In which case they settle for opks or whatever.
If you are serious about trying temping, I think it could work for you! You said you work 12-9? Why can't you go to bed earlier than 2am? Get home at 10, have a quick dinner, and it sounds like you can be in bed by midnight. Then set an alarm for when DH is likely to be waking you up anyway (6-7am) and temp then. Go back to sleep if you need more rest after that time.
Because you go to bed so late I'm assuming you must do your shower/hygiene at night? Can you move any of that to the morning, by chance? Is there anything you could move to the morning so that you could just wake up at 6 or 7 instead of 9?
If all of these changes sound too drastic to you, just keep temping through the fluctuating temperatures. You might still see an obvious shift when you ovulate.
Some people mentally can't wind down after a shift that quickly. I know with my husband, when he worked 2nds, he wouldn't get to be before 1-2AM after getting home at 11. But I agree with temping around the time your husband wakes up, that would still give you at least 3 hours of sleep, then go back to sleep. On your days off, things will be a little different, but I would think FF could pick up on that pattern?
Ah, yes, that is a very good point. I fall asleep easily at night and wake up easily in the morning even though DH is the opposite I insensitively forgot that other people are really not like me! On the flip side, I find it very hard to get back to sleep if I am woken up early so I was thinking that if the OP has to get up at 6 or 7 to temp she might have to just be up for the day.
OP, I hope that you can work with either being a night owl or being a morning person. If you're a morning person, I hope you can quickly transition from working to sleeping after you get home. If you're a night owl, I hope that you will be so tired at 6/7 that you can fall back asleep after a quick temp break at that time.
If you find both hard, maybe temping is just not for you. Or you can temp through the fluctuations. People on this board make a really big deal about temping and for reason, but it's not the be-all, end-all. Opks, combined with tracking cm, can accomplish quite a bit.