New to Two-Story Living

I just bought a two-story townhouse, and I am baffled about how to have a consistent temperature between floors. It is so warm up top while chilly down below. The temp spread isn't huge, but I need a cool room to be able to sleep. In that case, I have programmed my thermostat to stop heating about an hour and a half before bedtime, but it leaves that last hour or so enjoying TV before bed feeling uncomfortable, which is not the relaxation I'm used to before bed.

Anyone have any ideas...

New to Two-Story Living