Create app to log down nap/sleeping time and duration
- Export result as excel-like file (csv)
- Set password lock
- Set alarm
- Choose nap type: Short nap (< 45 mins) or Long nap (> 90 mins)
- Auto stop sleep time counting by screen unlock or Internet connection from off to on
- Auto start sleep time counting by screen lock or Internet connection from on to off
- Record sleep time
- Display sleep time in different types of graphs
- Local Storage
- Check storage limit before saving and give warning if almost exceeding the limit
- Have dashboard to show the statistic
- Check time with ntp server to avoid large error (beware with the timezone)