Welcome to the forum!
A lot of people here have different views but I’ve never encountered anyone being outright hostile or disrespectful of others’ beliefs here so I hope you find this space receptive to your views!
I figure your concern is waking everyone else up with an alarm and less that getting up would cause
a disturbance? If that is the case you might be able to adjust. Since I usually sleep alone I can only speak from what I’ve read from other people, but here are some ideas:
-If you being up causes to much disturbance, don’t stay up as long (I usually only stay up a few minutes actually, that doesn’t work for everyone but it might work for you?).
-Do you have a fitbit? I think I’ve read some people using a vibrating alarm on something like this or another kind of vibrating alarm to wake themselves up but not their partner or roommate.
-Use autosuggestions/incubations/mantras to tell yourself to wake up in the middle of the night, without an alarm. this might seem unreliable, but it can work quite well as part of a MILD technique. Check out this thread and this post for some discussion about MILD and autosuggestions.
-Drink some water or tea before bed so that you’ll wake up to go to the bathroom in the middle of the night? 
Kinda funny but I’m sure I’ve read this suggestion somewhere before?
You can find and start discussions about OBEs in the beyond dreaming section of the forum! It’s not something I know much about but many other lucid dreamers are also interested in that, so you’re not alone 