Mike, I have no doubt that sleeping under the stars is great. Many times I have set up the tarp and simply laid down to take a nap only to wake up at midnight to hang the bear bag and dig my bag out. Many nights we get a heavy fog or light rain in the mountans of the north east. Usually about 50/50 I would say. My last trip (8 nights) was typical...rain some part of every day. Well, it IS spring...
I misread a storm (actually 3 lightning storms and 1 rain storm) one night and set up the tarp a bit off center. The wind shifted and dampened the bag and shoes. But yes, never sleep in wet cloths. My sleeping cloths are *not* pj's. They are my insulation layer if things get really bad. One extra pair of wool socks, one mid weight smartwool shirt, one mid weight long john pants. If I do not need these for the morning, they get packed with the sleeping bag. These are *always* as dry as is possible. My pants, shirt, and rain jacket may be soaked, but, I will be sleeping comfortably. If needed, I can wear these for a while...they dry farly quickly. After several days of rain, they can get quite damp, but still do the job.