Mum often runs and hot cold, can be quite a challenge adjusting to compensate! The hands, especially the right is a biggy as it impacts her functionality; mealtimes where mum is determined to complete tasks herself (which I applaud her for) can be extended for lengthy periods. After numerous (failed) strategies I settled on a hot water bottle bagged twice in pillowcases across her lap with her wrists lying atop same. Not ideal but workable. Handwarmers were great to start off with but didn't allow for doing tasks as mum would be loathe to let go... Creativity is the name of the game with this one methinks!
Nighttime yep, warm then cold... adjust the blankets early a.m. and then she can be sweating profusely by 6am! I do have a bottle at feet, also one at bad knee and for cold hands. During the day if too hot mum will just drop off and zone out with loss of cognitive functioning. Have wall thermometers now by bed and in living room, if it hits 18 4° during the day - total shut down though!! Caught between the devil and deep blue sea on this as well 
I don't envy your own 'sauna' like bedtime!! I overheat myself very easily, how you manage to sleep - wow, I'd struggle.
