I'm going completely against the grain. I say DO IT!!
So long as your penis isnt blue or purple, then it being cold is fine just ease the clamp off when you wake up, I used to get this myself and I never had any problems.
I used to do this for a long while but I lost the clamp after like 2 weeks of doing it and never went back to clamping again. But I could tell I was definately gaining. Of course after 2 weeks gains were tempory but I think if these are done a lot you could grab real gains.
My theory on Penis Enlargement is that its all about the: Time under tension.
The body will only react quickly to growth of new cells if there is a constant demand for it. Doing hourly sessions is going to take a hell of alot longer for the body to react to the growth of new cells. I think this is why FR is working for me so well, becuase i'm doing it 24/7, more hours = more results and quicker.
Do what you feel, but I say go for it for sure.
I think if this will give a 'dead dick' my dick would be very dead by now after the things ive slept with on my dick. So long as there is a bloodflow (small granted) your dick wont constrict and die. if this was the case then people doing prolonged clamping sessions such as red's dick would also be dead.
Just make sure the clamp is not incredibly, tight but just tight enough to feel a comfortable tension.
And In response to red's post your on the right track about gaining (IMO) but not about the experience. When I started this I jumped in with clamps ( many years ago when I used to use cheekycherry, search for the "24 hour
cock ring" thread if its still there) and I was a complete clamping noob. My first time using clamps was with sleeping with it on.
Do whatever you feel.
Ex.