That sounds an awful lot like Zombee symptoms.
Infection by zombie flies causes unusual behavior in honey bees. Specifically, it causes them to fly out of their hives at night. Once out of the hive, they fly towards a light source as many insects do. But unlike other insects at a light source, the infected honey bees become disoriented and lose their balance; eventually they die.
Collect your dead honey bees and place them into a resealable container, something like a mason jar. Then watch for larvae that crawl out from the necks of the bees—right between the head and the thorax. You also look for pupae and then wait to see if they hatch into adult flies.
ZomBeeWatch.org has more information.