Dear Savvy Cousin,
The idea of a night light and flashlight are excellent and may be very useful in the future. I suggest you supplement the idea with a power symbol...an old remote (batteries removed), a toy truck/excavator/tractor, special stuffed animal, or anything that represents force to him.
I suggest bedtime be elongated (started earlier) and closets, drawers, and under the bed be searched and reported empty with some drama. A special 'power' drink (water with a splash of cranberry juice) could be introduced as a 'safety agent.'
Keep in mind that many five year olds are still clingy to their teachers, timid and shy. If this continues for another two months, I suggest a consultation with a child psychologist.
It is often thought that children with fears of aggression and harm are projecting their own wishes pushed by unexpressed anger. Whether this is the case or not, aggressive activities (constructive) can be introduced... like hammering nails into a piece of wood, tearing up newspapers and stuffing the pieces into an old white pillowcase and making a punching pillow, and building with LEGO or blocks and knocking it down before putting the pieces away,
are all great activities.
On another note, have you looked at the book Where The Wild Things Are by Maurice Sendak? This works for many kids, but has to be thoughtfully evaluated.
I hope this is helpful.
Natalie Robinson Garfield