Yes. I think they added Villages and villagers to make single player less loney.
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single player mode on minecraft
Yes, Minecraft can either be played single player on a local save, or multi player on an online server.
If you mean Minecraft Classic, this is not possible. Minecraft classic is only meant for building, not survival. If you want to have survival, you'd have to buy the full version. To change day to night in Minecraft premium (full), as of 1.3 the command prompt was added to single-player so issue the command /time set night.
You need the single player commands mod. Then you type /gamemode 1. This will change your survival world to creative. To put it back use /gamemode 0.
If you are playing on a PC single player mode, type /gamemode s This will toggle the gamemode back to survival mode.