When I entered perimenopause I had regular and persistent hot flashes, especially at night. This saved my life: http://www.chilitechnology.com It’s a mattress pad that cools down the bed, and you can set any temperature you want. I had been blasting the AC at night because I couldn’t get more than a few hours sleep without waking up sweating and my husband had to sleep on the couch in the basement where there were no AC registers because he was freezing. Our electric bill was skyrocketing and I still didn’t get a good night’s sleep from it. Way more efficient to just cool down the bed than the whole house, and it works so much better. I got the dual zone pad, which lets you set different temps for each side of the bed. It’s nice to have my hubby back next to me!