Are you currently (e.g., TV, hallway light, or nightlight)?

Your body operates on a 24-hour internal clock known as the . This system uses light and dark as primary signals to regulate sleep-wake cycles.

You are more likely to experience "micro-awakenings" or arousals throughout the night, leading to daytime fatigue and reduced cognitive function.

Use blackout curtains or a sleep mask to block outside light.

Sleeping in a lit environment is linked to several chronic health conditions. Studies have shown that even "dim" light (such as a TV or bedside lamp) can cause measurable physiological changes:

Nighttime light exposure can increase heart rate and the risk of high blood pressure (Sleep Foundation).

💡 If you need some light for safety or comfort, opt for a dim red light . Unlike blue or white light, red light has a longer wavelength and is less likely to suppress melatonin or shift your circadian clock. Recommendations for Better Sleep To optimize your sleep environment, health experts suggest: