The same rule that applies to hiking also applies here: Take only the things that you will definitely need and forget the rest!
You should always have a warm sleeping bag and a sleeping pad. We also recommend that you use a small tent or a bivi sack. You will definitely need a mosquito net or something else that will keep away unwanted small animals and insects. Take some water and small snacks with you as well. A Thermos flask filled with tea or another warm beverage also makes good sense. Warm clothing is another must because the temperature can fall sharply at night. Your packing list should also include a torch or head torch and a small first-aid kit. And don’t forget your mobile. You want to be able to communicate with the outside world at any time.