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When you body tells you it’s sleepy, listen, and go to bed.
If I go to nap for 10 minutes at 12:00 and then at 17:00, the next day I’m guaranteed to be sleepy both at 12:00 and 17:00. That’s how circadian rhythms adjust themselves. The only way to not be sleepy at 12:00 and 17:00 on further days is to overcome sleepiness and NOT give in.
Have a nice journey! Me using Lemmy started as “1 month popular sites alternatives challenge” which I arranged for myself after growing increasingly more annoyed by moderation at sites like Reddit and 4chan. Some other systems I started using more as a result of that are Mastodon and Bluesky.