What do you use to sleep on? If you use a cot you'd need some sort of insulating layer beneath you. If you don't own a Thermarest or similar pad you can get away with cheap, closed cell foam available at Walmart or any camping supply store.
If you are sleeping on the ground you probably already have a Thermarest type or closed cell foam pad, so you are set.
If you sleep on an air mattress that can be an issue as the air inside can get pretty chilly, making for a cold nights sleep. As with the cot, perhaps a closed cell pad between you and the air mattress will be helpful.
Sleeping bag is the next key. If you have summer weight bags you will need more insulation. Perhaps you have a down quilt or comforter at home or a few wool blankets that you can toss on top of your bags.
Bring plenty of lighting because it gets dark early. Headlamps and/or lanterns can provide enough light to complete camp chores.
Consider bringing a "chamber pot" inside your tent in case you need to answer "nature's call" in the middle of the night. Getting out of the tent on a cold, late fall or winter night to use the facilities (whether they are heated restrooms, an outhouse or a tree) is not very pleasant. A wide-mouth Nalgene bottle would work for this (just make sure that you don't mistake it for your water). Campmor also sells an inexpensive portable jon with a female adapter for this purpose and no chance you'll mistake it for your water. My wife has been known to use a large pan from our cookset in an emergency.
If you have a campfire, keep plenty of wood ready for a morning fire. Morning is when you will be the coldest. In the evening you'd probably be bundled up and in front of a campfire. At night you'll hopefully be warm in your tent, but when you are up and about first thing in the morning you're gonna freeze.
Bring your shoes inside the tent and if they aren't too wet try to get them under your blanket for the night. Failing that, bring a few packs of chemical hand warmers and place them inside your shoes about an hour before you are going to put them on.
Dress in layers rather than a single, heavy jacket. Synthetic, wicking underwear, thin fleece or wool shirt, thick fleece or wool pullover or vest and a windproof outer layer. This way you can add or shed layers as conditions dictate.
Stay away from any cotton clothing. Cotton retains moisture and if you sweat at all during the day you will have damp, cold clothing. That is uncomfortable at best and worst case could be fatal.
