Daire, I hope you are not insulted when I'm adding my 2 cents worth

to the above too
Night fishing can be fun if done safely, it's best to go with another fellow angler or at least let someone know where you are going. I highly recommend a Floatation suit or some form of a life aid

plus it pays to carry a mobile phone sealed up in a plastic water tight bag. Pick a mark that you are very familiar with, one that you can map in your head in the dark so to speak.
A good night fishing session compromises of two things: one, not blanking

and two safety
For Big Conger Fishing look to using the stiffest Beachcasters you can get hold of, along the lines of a Conoflex Highlander or a light boat rod. Use the minimum of 40lb mainline with 80lb+Shock Leader and a good quality Multiplier. When night fishing, beef up the tackle. 60+lb rig body, 30+lb Amnesia trace line for bottom fishing or 250lb mono for conger traces minimum.
Keep your rigs dead simple i.e. running ledger.
For bait Mackerel is a killer at night, also Squid is very productive. Be prepared to try out different baits depending on your area and what you are targeting. Some to try out are Sandeel, Ragworm and Peeler Crab. Pouting is said to be a top conger bait

, never got to try it myself though. Baits that fish poorly during the day can be amazing at night.
Good luck with your monster conger session and stay safe
Martin.