I was getting too hot in my 300+ count sheets and was sweating, so i googled ways to help this.
Several websites sd to get 200-250 count sheets (hard to find), but i found them on Wayfair, washed them before putting them on our bed, and the sweating has stopped.  The higher the thread count, the more likely it is you will sweat.
Yes, a higher thread count is softer....but waking up "wet" is no fun!
Excellent purchase from Wayfair!