Why do smoke alarms go off in the middle of the night?

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Tags

1. #alarm
2. #smoke
3. #coolest
4. #night
5. #homes
6. #chirp
7. #battery
8. #between
9. #middle
10. #sound
11. #cause
12. #characteristic
13. #degrees
14. #temperatures
15. #enter
16. #warms