ray the water dripping sensataion, is called "rain out". It's cause is due to condensation build up in the pipe with warm air condensing against cold room air on the inside. Most poeple with humidifiers will have to deal with it .
1 turn the bedroom heating up a fraction so the room temp is warmer, is one method, although in my case I cannot settle if my bedroom is too warm, just like the feeling of cuddling up under the bed clothes! I also have tried putting the tube in bed aside of me, works okish, but have also laid on it which then gives other problems.
2 An alternate is to purchase a cover for the hose, if you go down that way, be very careful, as often you see fleece type units for sale and they are of very flimsy thin material, and although look prety, they offer very little insulation. Resmed, do an insulating Jacket at a little more and from experience works well, another option is to make your own, which I also have done, by folding a fleece underblanket over and stitching together the same diameter of the hose, not pretty, but extremly effective, it also deadens the sound from air rushing through the pipe.
Feeling the benefit, is again I think a bit hit and miss, but again from experience, remember warm air carries slightly more water vapour than cold air, that also carries more oxygen, as our respiratory tract is made up of mucous membrain, it will absorb the air easier, hence one of the reasons you are not finding the benefit, may be due to the change of ambiente temps these last couple of weeks during the early hours.
Good luck, http://www.resmed.com/us/products/acces ... c=patients
shows the tube wrap I have, but not sure if they still do it, it may be worth ringing them in milton Keynes, their service is excellant, and normaly all by return post.