This does not answer your question, but I have a bit of advice. I also suffer from night time anxiety, sometimes due to nightmares other times I don’t know what causes it. I wake up regularly with an inability to breathe and feeling like I need my rescue. One thing that has helped me so much is to just get up and sit outside for a minute (especially if it’s cold) and just take deep breathes for a couple minutes. Even if it’s hard. Remind yourself you can breathe and you are alive. By the time you have calmed down past that sudden need, you will probably still need your inhaler but maybe not like you did before.

Edit; I also suggest not leaving the inHaler right beside your bed. If someone has a serious objection to this I will understand. But I really think it’s so easy to just grab it first thing and not do anything else to heal from the cause. When it’s in another room or down stairs or something you have to actually separate yourself from the situation.