I live alone: Put my phone on the living room table while I slept in my bedroom: Accelerometer still recorded movements?

Detailed description of the problem:
Put my phone on the living room table while I slept in my bedroom: Accelerometer still recorded movements during certain hours???

Steps to reproduce:
Put phone in living room table, set on airplane mode, no notifications etc, turn on sleep for android
Version of Sleep as Android:
22622 Premium

@Snooze many thanks for your feedback. The accelerometer is extremely sensitive, it may even record the underground or tram passing thorugh in a urban area or even you doing movement in the bed even it is on the side table… For is it is hard to filter out such signal as we don’t know whether this is you moving but the phone is further away or some other signal. We try hard so in the moring you usually don’t see proper sleep phases, but it may happen that some higher activity areas will get through our thresholds even with a phne on the side table… does that make sense?