New matress is making me sweat !?

I have never owned a brand new high quality mattress in my life so I'm not sure what to make of our new bed ... Super comfy medium to firm , but the first night I spent in it I was waking up boiling hot and with a sweaty back , we put a mattress protector on it due to the 30 night returns policy . Any... show more I have never owned a brand new high quality mattress in my life so I'm not sure what to make of our new bed ... Super comfy medium to firm , but the first night I spent in it I was waking up boiling hot and with a sweaty back , we put a mattress protector on it due to the 30 night returns policy .
Any opinions ?

It's a silent night matress .
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