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I hate those f'n things. My family biz that I run is apartments, and we had 170, so I deal with these all of the time.
Is it going off, or does it occasionally chirp? A chirp means a battery replacement.
If it is going off, the 1st thing I would do is swap it with another one and see if the problem follows the smoke. If it does, just replace it, but what Buckman says is almost always true (and if you have to replace them all, be sure to buy a couple of replacements). If the problem continues in your bedroom even though a different smoke is now there, dust/pollen/spiders may be getting into it. The hole made in the ceiling for the smoke may actually be venting your room, carrying the dust through the smoke, so you have to end that. Either attack that problem from attic space above, or grab a can of the spray foam insulation and tighten it up from below.
You may also open the smoke up and clean the reflective plate inside. These photo eye style smokes shoot a light beam inside the smoke, and if the beam is broken the interpretation is smoke (even though it may be dust/pollen/spiders). The test button on the smoke manipulates a small panel that the beam bounces off, so when you push the button the beam does not make contact with the receiving end. That panel can dust up. This is a relatively simple fix.
My experience is that if it only happens at night it is a spider inside the smoke doing its thing at night.
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