Should You Unplug Fairy Lights at Night?

Yes, unplug them. Fire and rescue services across the UK give the same instruction in almost the same words: switch off and unplug fairy lights and other electrical decorations before you go to bed or leave the house¹. North Yorkshire Fire and Rescue Service puts it as "switch off lights when you go out or head to bed"², and Northern Ireland Fire & Rescue Service says to "always turn Christmas lights off before going to bed or if you are leaving the house"³.

The reason is simple. A fire that starts while you are asleep is the one you are least able to escape from, and decorative lights are electrical equipment that runs unattended for hours. The National Fire Chiefs Council says festive lights should always be switched off at night or while properties are empty⁴. That is the whole answer, and everything below explains how to do it well.

Unplug them before bed, and before you go out

The instruction is consistent across England, Wales, Scotland and Northern Ireland, which is unusual and worth noting. Warwickshire Fire and Rescue Service says to unplug fairy lights or other electrical Christmas decorations when you leave the house or go to bed¹. North Yorkshire says to switch lights off when you go out or head to bed². Northern Ireland Fire & Rescue Service says never to overload sockets and always to turn Christmas lights off before going to bed or leaving the house, with one plug per socket³. The National Fire Chiefs Council, which speaks for fire and rescue services across the UK, says festive lights should always be switched off at night or while properties are empty⁴.

The same bedtime routine applies to everything else electrical. Northern Ireland Fire & Rescue Service advises a bedtime routine that unplugs all electrical items not required to be left on overnight⁸. South Wales Fire and Rescue Service's night-time checklist says to turn off and unplug electrical appliances unless they are designed to be left on, like your freezer⁹. London Fire Brigade's easy-read booklet gives the same exception: switch off and unplug all appliances except the ones that should stay on, like the fridge and freezer¹⁰.

So the practical version for a household is:

• Fairy lights and other decorative lights: off at the socket and unplugged¹
• Chargers: not left running overnight⁸
• Everything else electrical: off and unplugged unless it is meant to stay on, such as the fridge and freezer¹⁰
• Sockets: one plug per socket, never overloaded³

If you want a single trigger, tie it to the last thing you do before going upstairs. The fire service calls this a bedtime routine, and it works because it is the same every night⁸.

Why switching off matters more in winter

Winter is when decorative lights are up, when the nights are longest, and when the consequences of a fire are worst. The Wiltshire and Swindon preparedness pages note that a loss of electricity affects us differently depending on the time of day and the time of year: in winter the nights are darker, so lighting matters more¹¹. That cuts both ways. You rely on artificial light more, and you leave more of it running.

London Fire Brigade's winter guide is blunt about festive lights: switch them off when you are not at home or overnight¹². The National Fire Chiefs Council issued a reminder on home fire safety ahead of the festive season with the same message⁴. And the message is not only about December. Northern Ireland Fire & Rescue Service issued a safety plea after two house fire fatalities in one day, urging everyone to check their smoke alarms, never remove the batteries, and replace a faulty alarm immediately¹³. The service has also referenced recent house fire tragedies in December as the reason fire safety should remain a priority throughout the year¹⁴.

There is a second winter risk that often sits alongside fairy lights: candles. Fire services repeatedly warn that candles must be put out when you leave a room and made completely sure they are out before bed¹⁵. If a power cut has you reaching for candles instead of fairy lights, the same bedtime discipline applies, and the candle fire safety at home page covers it in full.

Check old lights before you plug them in

Before a set goes up, check it. The National Fire Chiefs Council advises checking that fairy lights are in good working order and replacing any bulbs that blow¹⁶. Dorset and Wiltshire Fire and Rescue Service says not to use them if they show signs of damage, such as frayed wiring⁵. Northern Ireland Fire & Rescue Service adds two more checks: that the lights comply with British Standards, and that you do not overload plug sockets, sticking to one plug per socket³.

A short check takes a minute:

• Look at the cable: any fraying, exposed wire or crushed insulation means the set should not be used⁵
• Check the bulbs: replace any that have blown⁵
• Check the plug and socket: one plug per socket, no adapters stacked up³
• Check the marking: the set should comply with British Standards³

If a set fails any of these, it does not go up. That is cheaper and safer than finding out at 2am.

Timers, batteries and outdoor sets

Can you leave fairy lights on a timer?

A timer is a useful backstop, but it is not a substitute for the bedtime check. The fire services' instruction is that the lights are off before you go to bed¹. Set the timer to switch off at bedtime, not in the small hours, and still check the socket and the set. A timer does nothing about an overloaded socket or a damaged cable.

What about battery fairy lights?

Battery sets avoid the mains, but the batteries need the same care. Mid and West Wales Fire and Rescue Service advises unplugging devices once fully charged and avoiding leaving them plugged in overnight⁶. London Fire Brigade says not to leave items continuously on charge after the charge cycle is complete, for example not leaving your phone plugged in overnight¹⁷. Dorset and Wiltshire Fire and Rescue Service goes further: it is never a good idea to charge an electrical product overnight, especially one containing lithium-ion batteries, because fires at night when people are sleeping are particularly dangerous as your reaction time is massively reduced¹⁸. Northern Ireland Fire & Rescue Service's student safety advice says to switch off and unplug electrics when not in use and before bed¹⁹. For rechargeable sets, that means charging during the day and switching off at night.

Can outdoor fairy lights stay on overnight?

No. The National Fire Chiefs Council's wording covers lights on a property, not just indoor ones: festive lights should always be switched off at night or while properties are empty⁴. North Yorkshire Fire and Rescue Service says not to leave Christmas lights on when you go out or go to bed²⁰. An outdoor set still runs from a socket or a battery, so the same routine applies.

Smoke alarms: the backup if a fire starts while you sleep

Switching off is the prevention. A working smoke alarm is the backup, and it is the one piece of kit that gives you time to get out. Northern Ireland Fire & Rescue Service advises installing a smoke alarm on all levels of your property, because a working smoke alarm gives you the vital time needed to escape⁸. The Northern Ireland Executive's fire safety advice says to make sure you have at least one working smoke alarm on every floor, and to think about extra alarms in the most used rooms such as living rooms and bedrooms⁷. The National Fire Chiefs Council says never to disconnect or take the batteries out of smoke alarms unless you intend to replace them immediately²¹.

In Scotland the standard is more specific. Every Scottish home should have interlinked alarms, a requirement that has applied since February 2022²². A flat or bungalow needs at least two smoke alarms²³, and one should be in the room most frequently used for general daytime living²³. If you have an open plan area, one alarm can cover the whole room provided it can be located no more than 7.5 metres from any point in the room²⁴. If you have a carbon-fuelled appliance such as a boiler, fire, heater or flue in any room, you must also have a carbon monoxide detector in that room, though it does not need to be linked to the fire alarms²⁴. Specialist alarms, for example if you are deaf or have a Telecare system, must be fitted in addition to the smoke, heat and carbon monoxide alarms, and existing Telecare alarms should not be removed²⁴.

For extra protection while you sleep, Fire Scotland advises fitting smoke alarms in the bedrooms too²⁴. The Scottish guidance adds that this is particularly important where there are extra fire risks such as televisions, computers or other electrical appliances in the bedroom²³. If you have open fires or a log burner, Dorset and Wiltshire Fire and Rescue Service recommends working smoke alarms and interlinked alarms if you have loft space²⁵.

A bedtime routine that covers the lights

The fire service advice adds up to a short routine, and it is worth writing down until it becomes habit. Northern Ireland Fire & Rescue Service's bedtime advice includes switching off and unplugging all electrical appliances not designed to stay on, avoiding leaving chargers on overnight, extinguishing candles, switching off portable heaters, putting a fire guard around open fires, closing all doors, keeping keys accessible, keeping escape routes clear and keeping a phone in the bedroom⁸. Dorset and Wiltshire Fire and Rescue Service's version adds closing internal doors at night to stop fire spreading and keep stairs free from smoke, checking the cooker is off, and checking door keys are easily accessible²⁷.

For the lights specifically, the routine is three steps:

1. Switch off at the socket and unplug the fairy lights¹.
2. Check the rest of the electrical items and unplug anything not meant to stay on⁸.
3. Check the smoke alarm is working, and never remove the battery¹³.

If you are without power and using candles, the Northern Ireland Executive's advice is to take extra care with naked flames and make certain they are put out before you go to bed²⁸. The same warning appears in its severe weather guidance²⁹. For a wider look at lighting a home safely when the power fails, see lighting your home safely when the power goes off, and for the full set of checks before winter, the lighting checks before winter checklist.