My smoke detector went off @ 3 am - but there wasn't a fire. Whyd they go off? ?

[kiwi]

Ok here's what I know
It's the kind where u can replace the battery however both batteries were changed when we moved into the house in march.
One went off at 3:45 the next one went off @ 3:55
Scared the heckk out of us & regardless of how tired I am i don't trust it now & am afraid that The second I close my eyes that theyll go off again!

Here's the answers I don't want :
- it's possessed
- batteries need 2 be changed
- its dusty or needs to be cleaned
- get new smoke detectors

Maybe Important detail:
The second time it went off-- we ran to shut it off & the second we opened our bedroom door it turned off. This is y I didnt wanna hear the "it's dirty"/"needs 2 be cleaned" cuz im already considering this. When we looked at it- it was blinkin red
It's been 15 min since it last went off & it hasn't gone off again! Hopefully it'll stop.
Tell me somethin I dunno plz!

 

[chris_94]

Are your smoke detectors connected to electricity? some connect to a live power supply as well as having batteries. A possibility could be that your power flickered off and on which caused them to set off?. If you don't think that's it, buy a cheap one and set it up. If that goes off theres something in the air which is activating them. Maybe a gas leak, you should get your house checked for safety reasons anyway.