I generally wont fish during the summer months because it's just too hot for me and the fish seem sluggish about biting. That said....when that itch needs scratching then I go fishing and long lining is all I do. It is effective if you find biting fish and can get your baits down to 'em.

Longlining at night could and would be very tricky. IMO, it's hard enough during the daytime running the trolling motor and watching all your rods. Now, throw in the fact of having to run a spotlight to make sure youre going where you want to and not hitting anything or running aground?!? I believe you'd be asking for more than you wanted. Besides, dont the crappie spread out & move shallower in the water column chasing the shad by moonlite at nite anyway?!?