I think everybody has given you some great ideas, but don't forget about time management. If you are running a 4hr block it is highly unlikely that you will actually be playing for 4hrs. Players going over the character sheets and picking which one they want to play, trying to figure out what...
I will be going to 4e no matter what the licenses is. Looking back at all the groups that I have played d&d with I can think of only 1 time that we ever used a 3rd party product. Maybe the groups I have gamed with are in the minority but it sure feels like a lot of groups do not use third...
Sleep
Attack +5 vs Will
Hit: The target is slowed(save ends). If the target fails its first saving throw against this power, the target becomes unconcious( save ends)
Miss: The target is slowed
No where does it say sleep does any damage along with its effects.