I found that the hourly time chime seems to be good and bad, and I haven't observed a regular pattern so far. For example, if it would chime the time at 8 o'clock yesterday morning, but it would not chime the time at 8 o'clock this morning, but it might chime the time again at 9 o'clock. My sleep pattern is from 12 am to 7 am on weekdays. ps: Sometimes it will chime the time normally on other hourly times throughout the day, but there may be a few hours every day when it will not chime the hour. No regular pattern can be observed. Does anyone have the same situation?