If you prefer to turn Alexa off while you’re sleeping, simply press the mute button on the top of the device.
If you have an Alexa device with a screen near the bed (Echo Show, Spot) and find the screen brightness to be too much for sleeping, you can dim the brightness by tapping your screen >Settings > Display > Scroll to adjust brightness.
If you prefer t a dark room for the night, say, “Alexa, turn off the screen.” Tap the screen or say, “Alexa, turn the screen on” to bring the screen back.