I continue to have night sweats after 4 years on letrozole. Very few daytime hot flushes, thankfully. I'm also a big fan of the Chillow which I have next to me in the bed and roll onto it when I'm too hot. I have a very lightweight duvet which helps. Also, without wishing to sound too gross, the night sweats used to wake me up because of the sweat running down my body. So I now sleep in thin pyjamas which soak up the sweat and I think that's help me to sleep better.
I haven't heard about the Ladycare magnet so will be interested to read any posts about that.