I have tried a few but they all seem to be putting the priority on features I don’t need, like recording the sounds while I sleep. I would just like a log of when I fall asleep and when I wake up.
EDIT: Here is my plan B, until I find an app: when I go to bed, I send a text message to myself. When I wake up, I do the same. It gets automatically time-stamped. Example:
“Ok Google, send a text saying Good Night to NemoWuming”
“Ok Google, send a text saying Good Morning to NemoWuming”
It is very hard to do that accurately. Fitness watches use accelerometers to detect body movement, pulse measurement etc. and still aren’t great. Real monitoring uses a lot more instruments including EEG. If you think you might need that, ask your Dr about a sleep study.