From my ToonZone.net post:

On Saturday, May 17, Nickelodeon will pre-empt SNICK (Saturdays 8-10 pm) and Nick@Nite primetime for Sleepover Jam 2003.

Nickelodeon's Sleepover Jam 2003 will be broadcast live and hosted by cast members from All That, which airs every Saturday at 8 pm.

The following is the marathon information, all times ET/PT:

8:00 pm The Adventures of Jimmy Neutron, Boy Genius: "Sleepness In Retroville" & "Maximum Hugh"
8:30 pm SpongeBob SquarePants: "Sleepy Time" & "Survival of the Idiots"
9:00 pm Fairly Odd Parents: "Sleep Over And Over" & "Mother Nature"
9:30 pm Hey Arnold!: "The Headless Cabbie (a.k.a. Haunted Taxi)" & "Helga Sleepwalks"
10:00 pm As Told By Ginger: "Sleep On It"
10:30 pm Rocket Power: "Netherworld Night" & "Welcome To Ottoworld"
11:00 pm Rugrats: "Party Animals" & "Sleep Trouble"
11:30 pm SpongeBob SquarePants: "Procrastination" & "Graveyard Shift"
12:00 am The Adventures of Jimmy Neutron, Boy Genius: "Sleepness In Retroville" & "Maximum Hugh"
12:30 am Fairly Odd Parents: "Sleep Over And Over" & "Mother Nature"
1:00 am CatDog: "Dem Bones" & "Dead Weight"
1:30 am Rugrats: "No Naps" & "Slumber Party"

Nick@Nite "overnight" will start at 2 am ET/PT after the special sleepover marathon, "primetime" is pre-empted from 10 pm to 2 am.

Will the 2AM-6AM sked remain as it is now?

- Brett