Well something is causing you to spawn at 0,0 coordinates, not sure how the save game goes in MP
As for the respawn, I've read that respawn is for MP only, but I could be wrong since I've played some SPs with 'respawn' (basically you just hop into another character). I suggest you look for some additional respawn tutorials (I know I got one from Youtube).
And sleeping in MP is not doable, as far as I know, you'd have to force everyone to 'sleep' somehow (though I can't imagine how to do this). Maybe better just place sleeping bags and forward time to simulate sleeping.