I think working for a few years in IT roles where I was on call 24/7 in case a server went down, where I worried that any call I got might be a disaster call, t

I think working for a few years in IT roles where I was on call 24/7 in case a server went down, where I worried that any call I got might be a disaster call, trained my brain to always consider the sound of my phone ringing as a possible emergency. I've been using the iPhone "Old Phone" ringtone for years now and when my alarm goes off I usually catch it by the first or second ring (confirmed by people who have actually called and woken me up). One other thing I've learned is that if I use an ascending alarm, where the ringtone starts quiet and slowly gets louder, it takes a lot longer for me wake up, presumably because my subconscious learns that an ascending ring is most likely not a phone call... my wife and daughter are awoken long before me if I use an ascending alarm, but if I just use a normal one I'm able to wake up and turn it off before it wakes them.