This information came from a NeoPortal

The Simpsons protest the next door construction of a stamp museum and successfully have it relocated to a cemetery lot. The family is dismayed to see the old cemetery moving into the museum's place on their neighboring lot. Lisa soon finds herself suffering fright induced sleepless nights and attempts to stay in her parents' bed. Homer and Marge attempt spending a night in Lisa's room to convince Lisa that it is safe; however, they are quickly scared away. While Homer and Marge turn to a psychiatrist for advice, Lisa decides to face her fears alone one night in the cemetery. After losing her footing, Lisa hits her head on a tombstone and has an unconscious vision of herself standing up to a handful of monsters who ultimately let her know that it's ok for her to act like a kid.

oh yeah! I've seen that one! lol I loved it!

yep that is a good episode