It might be worth giving the doctor a call to check whether this is an effect of the radiotherapy or if it is something that needs to be looked into. I hope you will hear from others here who have previously had radiotherapy treatment and that they will tell you what effects the treatment had on them.
I would definitely give his medical team a call and explain these symptoms, the fact that he is sleeping and cold all the time when it is so hot indeed at the moment.
Our nurses are also available on this free number 0808 800 4040, Monday to Friday from 9am to 5pm if you want to talk things through with them.
