I fish at dams and river banks that have no closing times. MN does not restrict those places, so you can fish at night. This past weekend, I was fishing at 2 a.m. in southern MN but didn't catch anything until 4:26 a.m. Cats were biting a lot at that time. Got my limit and then started fishing for sheeps head. Lost a fishing pole because I had set it on a frog as bait and was helping my partner with his catch 3 yards away: whatever was in the water pulled the pole right into the deep. I couldn't grab it in time.