https://factorio.com/terms-of-service https://factorio.com/terms-of-service > NATURE OF THE GAME > Especially we are not responsible if you stay awake all nigh

https://factorio.com/terms-of-service https://factorio.com/terms-of-service > NATURE OF THE GAME > Especially we are not responsible if you stay awake all night long playing Factorio and can't go to school / work in the morning :) They warn you ahead of time.