Should I turn my router off at night?
The intuitive answer is wrong on some connections. What it saves, what it costs, and why nightly disconnections can make a copper-based broadband line permanently slower.
- Difficulty
- beginner
- Time
- 15 min
- Read
- 6 min
Short answer
On a copper or part-fibre line, do not. Providers run automatic line management that watches for disconnections and reduces your speed to make an apparently unstable line reliable, and a router switched off every night looks exactly like an unstable line. On full fibre this does not apply. Either way the electricity saving is small, and things you may rely on — updates, backups, smart devices, and a digital voice telephone — stop overnight.
This is asked for three different reasons — electricity, wifi exposure, and a belief that the router will work better for a rest — and it has a genuinely surprising answer on a large share of UK connections. Broadband delivered over any part of a copper telephone line is managed by an automatic system that monitors the line's stability and adjusts its speed. Its logic is simple: a line that keeps dropping is running too fast, so slow it down until it stays up. It cannot distinguish a fault from a plug being pulled at bedtime, so a nightly switch-off is read as instability, and the speed comes down over days and takes days or weeks to come back.
Step by step
- Find out what kind of connection you have.Full fibre goes to a small box on the wall inside the house and the router plugs into it with an ethernet cable. Part-fibre and copper services run over the telephone line to a socket. Cable services use a coaxial cable. The catalogue's guides on broadband technology and on the ONT cover identifying yours, and the answer changes with the type.
- On copper or part-fibre, leave it on.Dynamic line management interprets repeated disconnections as instability and reduces the speed to compensate. It is a sensible mechanism doing its job on bad information. The effect builds over days and recovers slowly, which is why people rarely connect the two.
- On full fibre, the line penalty does not apply.There is no equivalent stability management, so switching off overnight does not cost you speed. The remaining arguments — what stops working, and reconnection time — still apply, and reconnection on full fibre is generally quick.
- Work out the actual electricity cost before deciding on that basis.A domestic router is a low-wattage device — typically under about fifteen watts, and often less. Work it out with your own tariff's unit rate rather than a figure from an article: watts, divided by a thousand, times hours, times pence per kilowatt hour. For most households the annual figure is small enough that it is not the deciding factor.
- List what actually stops.Overnight updates for phones and computers, cloud backups, smart plugs and heating schedules, security cameras and doorbells, a digital voice telephone, and anyone in the house on a different schedule. The camera and telephone cases are the ones that matter most, and the telephone one may be a safety issue if anyone relies on a personal alarm.
- Turn off the wifi rather than the router if exposure is the concern.Most routers have a setting, and many have a schedule, to disable the wireless radios while keeping the line connected. That addresses the radio concern without the line management problem, and it is the correct compromise for anyone worried about wifi in a bedroom.
- Use a schedule rather than the plug if you want the children offline.Routers and most parental control systems can stop specific devices reaching the internet at set times, which is more precise than switching off the whole house and does not interrupt the line. That is the better tool for the actual goal.
- Restart deliberately rather than habitually.A restart is a legitimate troubleshooting step and an occasional one does no harm. It is the nightly pattern that line management reacts to, not the individual event.
Common mistakes
- Switching off nightly on a part-fibre line to save money — The electricity saved is small and the speed reduction from line management can be substantial and slow to recover. It is the clearest case of a saving that costs more than it saves.
- Assuming the router needs a daily rest — Routers are designed to run continuously for years. A restart occasionally clears a genuine fault; a nightly one is not maintenance.
- Turning the router off to stop children being online — It is a blunt instrument that also stops backups, cameras, heating and the telephone. Device-level scheduling in the router or in parental controls achieves the actual goal precisely.
If it doesn't work
Speed has dropped over weeks with no other change
Cause: Line management responding to disconnections — Fix: Leave the router on continuously for a couple of weeks. Recovery is gradual by design — the system raises the speed only once it has seen sustained stability.
Router takes several minutes to reconnect each morning
Cause: Normal resync on a copper-based line — Fix: Expected. The line has to retrain each time, which is part of why frequent disconnection is read as instability.
Smart heating did not come on
Cause: The controller lost its connection overnight — Fix: Most heating controls keep a local schedule and survive, but some do not, and remote control certainly stops. Check yours before making the router's overnight state part of the routine.
Phone did not back up overnight
Cause: Backups are scheduled for when the phone is charging on wifi, which is overnight — Fix: This is exactly the window most phone backups use. A router off at night means backups that quietly never run — the catalogue's guide on checking photos are really backed up is worth reading.
Landline does not work in the morning
Cause: Digital voice depends on the router — Fix: On a digital voice service the telephone runs through the router and is dead while it is off. If anyone in the house depends on the phone, including for a personal alarm, this is a decisive argument against.
Wanting less wifi in a bedroom
Cause: A radio exposure concern — Fix: Turn the wireless radios off on a schedule, or move the router. Both address the concern directly without touching the line.
Questions people ask
How much electricity does a router actually use?
A domestic router is typically a low-wattage device, usually somewhere under about fifteen watts, and often considerably less on full fibre. The reliable way to know yours is the rating on its power supply or a plug-in energy monitor, and then your own tariff's unit rate — the catalogue has guides on working out what an appliance costs to run.
Does turning wifi off at night help anyone sleep?
There is no established mechanism by which wifi radio affects sleep, and the exposure is far below the guideline limits. What does affect sleep is having devices in the room and connected — and switching the wifi off does address that, by removing the temptation rather than the radio waves.
Is it different for a mesh system?
Mesh nodes take time to re-form their network after a power cut, so a nightly switch-off means a period each morning where coverage is patchy. The main router's line considerations apply as well. It is a further argument for leaving things on.
What about going away for a fortnight?
A single switch-off for a holiday is not the pattern that line management reacts to, and it saves a fortnight's standby power. Consider what needs to stay online first — cameras, heating, a doorbell, a freezer alarm — because those are usually the reason to leave it running.