Research Article
BTP: A Bedtime Predicting Algorithm via Smartphone Screen Status
| Target | Event Code | Meaning |
| Record screen status | SON | Screen light up | SOFF | Screen extinguish |
| Filter period not at home | AH | Arrive at home | LH | Leave home |
| Filter unexpected interrupt | IC | Incoming call | RM | Receiving message | AN | App notifications |
| Record alarm clock status | ACR | Alarm clock ring |
| Record power status | PON | Power on | POFF | Power off |
| Decide awakened or not | AA | Accelerometer activated |
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