insomnia
increased unpleasant dream activity.
There are different forms of chromium compounds:

trivalent chromium
hexavalent chromium
Trivalent chromium is the form that is considered to be the trace element needed for human and animal health. This form is not toxic unless large amounts are taken; although there have been actual cases where people have taken too much ... they developed insomnia and had bad dreams. In earlier studies, cases of people developing aneurysms were reported on levels greater than 200 mcg/day.

https://healthierlifeblog.com/reviews/supplements/altai-balance/