The Role of Room and Core Temperature in Sleep Quality

Both your room temperature and your core temperature are related to how well you sleep.  As much as you want to rug up with 2 layers of bedding and long sleeve pyjamas, think twice, as your sleep quality can decline. 

Conventional "wisdom" says you shouldn't sleep on a mattress for more than 10 years. 

But, there are many variables that go into why this number was created.