Night

How To Survive alternates routinely between day and night periods. A relatively brief period of reddish dawn/dusk lightning also exists.

Sleeping, among other functions, speeds up the passing of time and therefore makes the shift between day and night occur more rapidly.

Several renewable, most notably plants such as the Cassava Roots and Healing Plants, as well as the various colored plants and the Exotic Fruit. It is likely that the Medikit also respawns with the passage of day and night.