I've been 'wearing' one for about a fortnight now. In desperation really, since I was waking every 20 mins hot, chucking duvet off then falling asleep again, waking 10 minutes later cold, pulling covers on again, ad infinitum over the course of the night. I've always needed lots of sleep and am quite evil if I don't get it, and hadn't felt so tired since I did a milk round in the 90's! After almost crying when the milk went lumpy in my morning earl grey, then throwing a bucket at the stable cat (don't worry, my aim is pants!) I decided I needed help!
well, first night I slept straight through! the following three or four nights I slept better than I had been, but still waking 4 or 5 times. gradually I have been sleeping the whole night again, except when bothered by slightly 'period pain' type pains.
Now I'm happy to accept that these episodes of flushes peak and wane, and that I might just be having a 'wane'! but I'm not taking the magnet off to test it!
It will likely be the effect of the improved sleep, but have regained my positive attitude which is so important to me. I hated losing that! so, I'm erring on the positive side with the proviso that it might just be a coincidence. and apart from feeling a bit premenstrual and heavy (oh and sticking to the kitchen cabinet handles!) there are no down sides and maybe a big plus! Will keep you posted!