Smoke alarm question?

Smoke alarm just went off fully for around 10-15 seconds super loud woke everyone up (2:20am)... however when I got up to turn it off by the time I got something to reach it it had turned itself off... now additionally I should say it went off without reason, no smoke, humidity, bugs ( that I could see) or anything... show more Smoke alarm just went off fully for around 10-15 seconds super loud woke everyone up (2:20am)... however when I got up to turn it off by the time I got something to reach it it had turned itself off... now additionally I should say it went off without reason, no smoke, humidity, bugs ( that I could see) or anything so a 2 questions... why’d it go off and why’d it turn itself off afterwards?
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