We had a huge problem with this when DS was 3-5. Every night, 2-3x a night. Interestingly enough the thing that helped him the most was giving him instant breakfast before bed. A full belly made the nightmares almost go away entirely. When he doesn't get filled up before bed, they come right back. I don't know why it works, but it's worth a try.

Hell, when your kids not sleeping, anything is worth a try!

Shari
Mom to DS 10, DS 11, DS 13
Ability doesn't make us, Choices do!