Double sided keyed locks and safety
In my case, I only lock one lock when I'm in--the door closest to the bedroom. My approach for fire safety and burglar security is that put the key in that lock when I come in, and take it when I go. The car key I use is with that key, so if I'm driving someplace, I'm forced to remember to grab the key out of the lock. The one flaw: it's not so easy to remember to put the key back into the lock when I come back--particularly when I've got a billion things I'm trying to juggle at once.
I've also got another key on a second set of keys. That is always in the bedroom when I'm in, and in roughly the same area.
I don't bother locking the primary entrance's deadbolt when I'm in. I just use the doorknob lock. From what I observe, I don't think someone breaking in during the night is that likely where I am. Most night crimes seem to be out-of-house--car break ins, things stolen out of the yard, and--oh, yes--one neighbor did have a toilet stolen out of an abandoned mobile.
I suppose my approach would vary under other circumstances--living elsewhere, or with another person, etc. It's amazing, actually, how many different systems I've had over the years for just handling the keys I carry.