I still don't know if I would go to bed damp in cold weather...
 
Yeah I always wear a fleece hat to bed and sometimes a hoodie.

i was speaking towards summer camping... non-winter

who the hell wants to camp in the winter?


the best way to dry clothes is to wear them

The reason for stripping down is that clothes hold moisture and dirt close to the body.  Of course after 7-10 days in the boonies EVERYTHING is dirty, but taking clothes off helps air them out.  If wet I always recommend getting out of the wet clothes ASAP!.  I've seen guys go down with hypothermia in 45 degree weather because they stayed wet.  But then again I always recommend wool over underarmor or tactical under wear then you can stay somewhat warm.  If you can't dry out then keep it on but if you have a chance to dry out do so.  We can agree to disagree.   If you can make a fire and dry them out GREAT!.

KJH,
    Try Alaska, or northern Germany, or Afganistan, or Korea in the winter.  Or Alaska or N. Germany in the spring/fall.  Constant rain and cold.  And we really didn't have much of a choice.  ESP in Korea and other remote locales.
 
Cold, That's why we have a phrase called going "light"; in the summer in was socks, water, poncho, food, AMMO.  And of course the big medic kit.  I actuall wish I could still go out and do it.  Always wanted to hike the App. Trail.  But at the speed I walk anymore that would take Ohhhh, about 200 years.  May book the week-long trip to the Grand Canyon if I can ever get my legs to work right.
 
Here's a hint: Since they put the dams in on the Colorado, the river below the dams has become excellent trout water.

heater + tent = fire

If you use one, make sure you get a model that had a CO detector and will shut off automatically.  If you choose to use one, sleep on a cot (CO is heavier than air and will shut the unit off before you are in danger.  Sometimes my buddies and I run a portable heater in our tent while Ohio Deer hunting for a week.  It does work, and usually keeps the tent in the mid 50's.  The one we run is electric and powered by a portable generator. 

If you choose not to use a heater, there are other ways of keeping warm, even during single digit temperatures.  First thing is to put down a waterproof tarp (same size as tent).  Next, put down a bed of straw (cannot be hey), followed by another identical tarp.  Put your tent on top of this.  FYI, a tent with a good fly is invaluable as you will find out.  From there, build your bed (do not use air mattresses... cold, although thermarests are ok).  When you feel you are warm enough, build a ventilated canopy around your head of blankets that do not actually touch your skin.  Keeping your face out of the blankets, you will freeze... touching the canopy will get you wet from condensation, but a canopy keeps a nice warm air pocket around your head.  Another thing I usually do is to put the next morning's hunting clothes in my bag with me, or underneath me if they will lay flat.  I personally like getting into warm clothes better than frozen ones... 

Bottles filled with hot/warm water thrown into your bag does wonders to keep you warm at night. Surprizingly, they'll stay warm for 5-6 hours! 

Also, never sleep in clothes you've had on all day! Any moisture at all will be noticed real quick. Always put on dry fresh clothes before you crawl into the sack!

Listen to Indsquiz, he knows what he is taking about, never go to bed wet, typically comman sense won't let you unless you are already hypothermic or dead drunk (this is an area where your buds can save your life). On the original subject of the Buddy Heater use it to warm your bag then get it out of the tent , getting into a warm bag saves tons of body energy from the get go. 

There is some good advice on winter camping, however noone really touched on the stuffing material in the sleeping bag.  I remember in scouts one year my buddy got a brand new sleeping bag rated for minus 15 that was filled with down.  I heard all day how awsome this sleeping bag was and how warm he was gonna be.  It was in the single digits and fairly damp, he cried all night because he was freezing.  Down is good in dry weather but has poor insulation capabilities when damp.  Wool is warm when damp, however it is fairly heavy.  The backpacking sleeping bags are fairly expensive and contains stuffing that is warm in cold and damp weather.  I have camped numerous times in the winter, as others have mentioned sleep in your underwear.  The sleeping bag keeps you warm from body heat, the more cloths you have on the more restricted the heat is produced by your body. 

Eskimos know one thing, don't touch the water.  Evaporating water just removes heat from the body.  If wet, you gotta change.

I made a tent/ice shanty heater that works very well.  I rarely use it, unless it is incredibly cold, but it is the cheapest, safest, most relaible thing I have found.  Take a small metal coffee can, Folgers, etc.  The kind that is about as thick around as a roll of toilet paper, not the giant coffee can.  Use the coffee, save the plastic lid.  If necessary, file down the metal edge so it is smooth with no burs or sharp pieces.  Get a roll of toilet paper that will fit snugly in the bottom of the can.  Remove the inner cardboard from the roll of toilet paper and discard.  Squeeze the roll into the bottom of the coffee can.  Get a bottle of rubbing alcohol.  Douse the toilet paper in the fuel, up to a level at the top of the toilet paper roll and light.  Obviously this is an open flame, so take all precautions.  It burns very slowly and evenly with a clean invisible or blue flame.  (Because it can burn invisibly, you need to be careful to make sure it is really extinguished)  The toilet paper, itself will not burn, as the ignition point of the alcohol is much lower than the paper...  If the paper does start to burn, you don't have enough alcohol in there.  extinguish the flame, add more alcohol and relight.  DO NOT TRY TO ADD ALCOHOL WHILE THE FIRE IS IGNITED>>>  Burn it in your tent for 10 minutes before bed, extinguish, allow the metal to cool for five minutes and then replace the plastic top to keep the rubbing alcohol from evaporating...  The nice thing about rubbing alcohol is that it is far less toxic than oil based fuels, has little smell, produces less harmful fumes (still needs to be vented, but not nearly as much as propane, or kerosene) and plus, it never hurts to have a bottle of rubbing alcohol with you in the woods to clean cuts, wash your hands, start fires when it is damp, etc...