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I keep a text log and add entries manually every morning. I add my best guesses for when I actually fell asleep and when I woke up. I also log when I woke up in the middle of the night and for how long.

I'm interested in using a device, but I'm skeptical of the accuracy for data like how long my REM cycle were: https://www.menshealth.com/health/a26932734/sleep-trackers-a...

For just knowing roughly how long I'm sleeping each night (and how consistent my bed and wake times are), my text log has been good enough.

I'm not even sure I should be keeping track at all. As the article points out, it may exacerbate sleeping problems by causing me to worry too much about sleep in the first place.

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