"Warm at night in orthopaedics"

I have previously received a hip replacement years ago. As time has passed, I have been scheduled for a further hip replacement. I am awaiting an operation which I am hoping to get tomorrow, however it is a complex process due to my prior operation, so they need to check the tissue around my hip. The orthopaedic ward has been fantastic. All the staff are very good, the hygiene is superb. However, my only complaint is that I find it difficult to sleep at night due to the heat.