WOW...I had no idea they SPEND the eve @ WDW! Not even CLOSE to the manner in which this annual event plays-out here in Southern Cali each spring. DD is taking part in this rite of passage at the end of next month, and here are the details of their GRAD NIGHT @
DISNEYLAND:
At the end of the BBQ, @ approximately 8:30 pm, all students participating in the DISNEYLAND GRAD NIGHT event shall board the two commerical buses (w/chaperones) rented specifically for this evening. After a short transport (about an hour by way of bus), the students will arrive at DISNEYLAND for a late-night/early morning memorable time shared in the MAGIC. At approximately 5:30 am, the students will board the bus for a ride back to the school. Exhausted (expectedly), they will enjoy a Post-GRAD NIGHT catered breakfast inside the hall, and proceed to their homes for some much-needed REST!
Students are NOT permitted to drive themselves to the event. ONLY Senior students & school chaperones are permitted in Disneyland for this event. Students are NOT permitted to spend the evening in Anaheim, and MUST return on the bus to the school. No parents/family members may attend this event, or meet with students before/after this event.
The rules which were outlined during a mandatory meeting last Wednesday eve, were more strict than I realized! None of the following will be permitted/tolerated:
*purses, bags, fanny packs, cell phones, sports team shirts, any school/group/club-affiliated clothing, hats/beanies/wigs, baggy or torn clothing not in good repair, inappropriate or revealing clothes, shoes with skate wheels are not allowed, laser pointers, weapons, knives, chemical irritants of any kind, prescription medicine (with the exception of an inhaler after it has been checked by medical personnel) must be given to a chaperone, over-the-counter medicines, tobacco products of any kind, and related materials (lighters, matches, pipes) etc.
All belongings must be safely stored in rented lockers with the exception of cash and a camera. There were even personal items listed such as eye drops, sunglasses (after all--it's at night) and lip balm which can NOT be carried by ANYONE. If anyone is caught violating any rule, the item(s) will be confiscated and they will be escorted out of the park and onto the bus, where the driver is resting (waiting). If warranted, the student may even be arrested/charged for the violation.

They do NOT tolerate any messing around.
As DebbieDoo wrote, I presumed this policy was standard across the boards (thus blanketing all the parks, etc). It would be impossible for ANY student from DD's school to SPEND the NIGHT in any resort, unless she returned to the park AFTER she had returned to the school on the bus with the class. On top of that, I believe most of these kids will be EXHAUSTED...and not in any condition to PARTY! They are going to want to SLEEP. LOL.

It's comforting to know that my DD will not be bothering or even interacting with any other guests during this event. Perhaps WDW should implement this strategy as well.
*As far as the "noise" from the parks after hours? Both Disneyland and Disneyworld are frequently "Testing" NEW Firework shows, and other attractions (standard maintenance and upkeep). Therefore, we have heard noises and loud booms many times over the years while staying on property. It's never consistent, repetitive, or even lasts long enough to bother us.