My eyes open.
Oh, you're asking what devices we use to wake us up. My internal clock wakes me up. And my hungry kitty. I do need to figure out how to adjust the kitty alarm because he has been waking me up too early lately.
To help me stay awake when the mornings are dark, like now, I have a light on a timer. It doesn't wake me up but helps keep me from trying to go back to sleep.