I use a few of these for larger sized beds.
Ideal when staying in hotels too.
http://www.safety1st.com/uk/eng/Products/Home-Safety/Bed-guards/Details/2014-35020720-Portable-Bed-Rail
Actually, my view is that the temp need not be cold, but just cool enough not to feel humid.
It takes trial and error to find that ideal temp, ard 26-28.
Cold hands is not a good condition to be in.