How to light up the iPhone screen during FaceTime?

I FaceTime my boyfriend every night before I go to sleep, but most of the time I've already turned my lights off. My bedside lamp is broken, and I would totally get up and turn the overhead light on, but IIm just so dang comfy in bed at that point. Is there any way for me to light up the screen so light will shine on my face and he can see me? IIm thinking something along the lines of the front-facing flash on snapchat, or anything else y all can think of that will do the trick.

Turn your brightness on high, the screen will act as its own flashlight.

Additional smart phone flashes are readily available in the market and online.
They can pe plugged in the earphone socket of your iPhone.
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While for the second option you can download any of the flashlight app which mainly is to use your camera flash as a searchlight but good thing is they all mostly have this option of litting your screen to It's full extend.
That would definitely work for you.