We’ve all been there: You hit the pillow, and for some reason you remain wide awake! Here’s a surprising tip to help you with insomnia: Go to sleep with the bedroom door open.

A recent study in Indoor Air: International Journal of Indoor Environment and Health observed a group of healthy young adults sleeping over a period of five nights. Those who slept with the bedroom door open reported a better and longer night’s sleep than those who slept with the door closed. Why would this be the case? Perhaps opening the door provides more ventilation to the room, allowing some to drift off to sleep more easily. In addition, opening the door dropped the room temperature to about 67 degrees Fahrenheit. We know that the optimal temperature for sleep may be around 65 to 68 degrees. I’m Dr. Michael Hunter.