Thanks for the feedback!
Heres a quick overview: over the course of a day, you become tired (black vignette). You can reset this by sleeping at a fireplace (pile of woods) which also respawns fruits. In this game a season lasts 3 days (unless you eat a specific fruit that kind of makes you hibernate and skip 3 days the next time you sleep). Lastly all fruits have different effects in one specific season.
Hope that explains stuff ;)