Bat ponies: Are nocturnal by nature! This matches up with the schedule of the princess most bat ponies serve, Luna. However! Through a lot of effort, they may be able to pull of a daytime life. It would be like a human trying to convert to a nocturnal schedule, though. REALLY UNPLEASANT for quite a while during the adjustment period.

As for attacking Celestia... well. Attacking a princess is high treason in Equestria no matter how pathetic the attempt. Celestia is a very merciful ruler and believes in rehab, though. Dan may find himself in the pony version of an insane asylum, because what pony in their right mind would attack the princess?