From a sleep health perspective, it is not recommended to sleep with fairy lights on (Image: Freepik)There’s something magical about sleeping with fairy lights on, or even warm lights. These lights can make a bedroom feel cosy, calm and Instagram-ready. But while they may help set the mood, sleep experts warn that keeping them on through the night could quietly disrupt your sleep in ways you don’t realise.According to Dr Pooja T, Senior Specialist Pulmonologist at Aster RV Hospital, Bangalore, even dim decorative lighting can interfere with how deeply and how well we sleep.DISCLAIMER: This article is based on information from the public domain and/or the experts we spoke to. Always consult your health practitioner before starting any routine.“Human sleep is designed to occur in near-total darkness,” she explains. “Any artificial light during sleep can interfere with the brain’s ability to fully switch into restorative sleep modes.”That means exposure to light at night can reduce deep sleep (slow-wave sleep) and REM sleep, the stages most important for physical recovery, memory and emotional balance. The result? You may wake up feeling unrefreshed, foggy, and more tired during the day.Even dim lights can affect your body clockMany people assume fairy lights are too soft to matter — but that’s not entirely true.“Even low-level ambient light can suppress melatonin production,” says Dr Pooja. Melatonin is the hormone that signals to your body that it’s time to sleep. When light is present, especially during the night, the brain receives mixed signals and may delay releasing enough melatonin.Story continues below this adThis can disrupt your circadian rhythm, the body’s internal clock that regulates sleep and wake cycles. Over time, regular exposure to light at night can make it harder to fall asleep and may even shift your natural sleep schedule. Even low-level ambient light can suppress melatonin production, the hormone responsible for signalling the body that it is time to sleep (Image: Freepik)Colour and brightness matter more than you thinkNot all fairy lights affect sleep equally. “Blue or cool-toned lights have the strongest impact on melatonin suppression because they closely mimic daylight,” Dr Pooja explains. These are often found in white or LED fairy lights. Warm yellow or amber tones are less disruptive, but still not ideal for overnight exposure.Brightness is also key. “Even small fairy lights placed close to the bed or within the field of vision can affect sleep if they are bright or flickering,” she says. In short, cooler and brighter lights cause more sleep disruption than dim, warm-toned ones.Also Read | This is what happens to the body when you sleep for just 2 hours daily for a long timeLighter, more fragmented sleepSleeping with lights on doesn’t always wake you fully — but it can keep your brain in a more alert state. “Studies show that sleeping with any light source can result in lighter, more fragmented sleep and more frequent nighttime awakenings,” says Dr Pooja. These brief “micro-arousals” may go unnoticed but still reduce overall sleep quality. Over time, this can contribute to daytime sleepiness, irritability, reduced concentration, and even metabolic effects.Story continues below this adSo, should you sleep with fairy lights on?“From a sleep health perspective, it is not recommended,” Dr Pooja says. Bedrooms should ideally be as dark as possible to support natural sleep. If you need some light for comfort or safety, she suggests using a very dim, warm-coloured night lamp, placed low and away from direct line of sight. Using timers or switching off decorative lights before bed is a better long-term habit.Thus even though sleeping under fairy lights seems very Pinteresty, your brain needs darkness to fully register that it’s time to rest.DISCLAIMER: This article is based on information from the public domain and/or the experts we spoke to. Always consult your health practitioner before starting any routine.