yeah personally I share Stabbey's opinion.
If you really want to play with a specific friend then play this game only with him !! and start a single game for you, or if you really want to continue the game solo, just save on another save and when your friend is available load the prior save...

"-Oh that's fullmoon, cuttie cuttie sheep
-baaaaaaOOOOORGH"
***Sprotch***

Weresheeps will rule the world (At least one night every 29 days)