Sleepless in Ponyville - Episode 6, Season 3
Wow! Another home-run episode!
There was a much tighter focus than the previous one. Excellent character development, lots of funny moments, and a somewhat hackneyed but very relevant and valuable moral (it's great that the writers don't shoehorn a letter to Princess Celestia into every episode any more; it makes the lesson(s) feel forced). Plus, Scootaloo finally takes center stage!
The real surprise was the appearance of Princess Luna, who, for once, is the one who dispenses wisdom rather than digesting it. Although some fans might object I, for one, welcome her newly established role as the Warden of Dreams (she IS the Mare of the Night...the Night-Mare); it makes sense that she'd watch over her subjects at night while her sister watches over them during the day. Fanfic opportunities ahoy!
"After that faithful encounter with Princess Luna, Scootaloo would be inspired to go on to join the Nightguard - the mysterious, bat-winged pony soldiers comprising Luna's elite personal bodyguard."
Princess Luna vs. Freddy Kreuger
So...she watches ponies while they dream. Does this include wet dreams? And here I thought Princess Molestia was the perv.