Huffington said another "absolute no-no" is letting any kind of light in the room.
Whether it's the light streaming through your blinds from the streetlamp next to your window, or the blinking lights from the TV, phone, or even the smoke detector, Huffington said all of these lights are preventing you from getting much deeper, restorative sleep.
She said that she always covers these lights, even when traveling, either with black-out curtains, black tape, or a towel.
"I promise you, your sleep is going to be so much deeper, and so much more restorative, that it's totally worth it," she said.