Why wont my screen light up when I look at it?

[AC Question]

I just got my moto 360 today and when I bring my wrist up to look at the time the screen will not light up. I've even tried ambient mode and it still won't light up when I look at the screen. What should I do?

 

[B. Diddy]

Welcome to Android Central! 1st or 2nd gen Moto 360? When you say Ambient Mode, do you mean Always On Screen? When you bring your wrist up, are you also twisting it so that the watchface tilts to face you?