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”
- I’ve used Sleep as Android for several years. It does a great job of determining when I’m asleep and awake and even offers recommendations based on the data it collects. 
- 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. 
- https://vmiklos.hu/plees-tracker/ - a simple timer, plus its foss 
- I have a cheap smartwatch (amazfit bip) that tracks sleep and I have found it to be very accurate for me. I assume it tracks when I fall asleep based on heart rate and movement? - Anyways it plays nicely with my android phone and only cost about $50 and honestly I’m pretty happy with it! I was pretty skeptical at first but it’s really handy as a fitness tracker too and I feel like it encourages me to stand up and exercise more. - I also have a somewhat erratic sleep schedule and it’s nice to know when I’m starting to get into a sleep deficit and need to get caught up. - I have a Bip as well, and aside from the silly name I love it. Even after 5 years a single charge lasts more than a month. - It tracks my sleep and steps, and is always on (other smartwatches turn the display off to save the battery). - It doesn’t do all the fanciest things. I can’t answer phone calls or send text messages (it will display received messages), but the advantages far away the drawbacks. 
 
- Yeah it’s called a text file. - Satirical, but it’s actually my plan b, until something automatically does it. So upvoted lol ¯\_(ツ)_/¯ - It’s not really satirical. - Why do you need a program that tries to predict things about your sleep, or that checks the clock for you at the push of a button? It’s overcomplicated crap that doesn’t actually add value to your life. Just write it down. - I guess you have a pretty regular sleep schedule… I don’t. I have issues sleeping, so sometimes I would go to bed at 2am and fall asleep at 4am, other days I would go to bed at midnight and fall asleep immediately. I sometimes wake up at 7am when I have to go to the office, sometimes at 9am, right before the morning meeting when I work from home. During the weekend I wake up between 10am and 2pm… I also frequently wake up during the night, I don’t have a very deep sleep. So being in bed for 6 hours might only mean 5h of sleep. I am a zombie when I wake up, so I would most likely forget to write/mark down the times. It’s just not feasible for everyone to do that manually. - To answer OP, I use my Fitbit to track my sleep. Before I got my watch, I used Sleep for Android. 
- I work on an irregular schedule, so I want to keep track to make sure I get enough sleep. It doesn’t have to be super accurate, just a number of hours elapsed, to decide if I go back to sleep. 
 
 
 

