Low blood sugar I understand - diabetes is also associated with night sweats.
Once you have been checked out for other conditions or infection as Taz suggests then if all is well, time to think about maybe trying a cyclical HRT as I do? Probably not ideal to be increasing the dose once you're in your 60's although if the regime is not sufficient to eliminate night sweats and there is no other cause of these then that is a potential option.
Hurdity x