TV turning on by itself
A TV turning on by itself has most likely been woken by another device: a game console, a forgotten timer or a smart speaker that misheard its name in the dialogue. People do the same with words never intended as orders.
What it may mean
A television that switches itself on in an empty room is unnerving, and stories about spirits in electronics thrive on exactly this scene. The usual culprits are ordinary. A game console or streaming stick wakes the set through the cable that links them, a forgotten timer kicks in, or a smart speaker hears a line of dialogue as its wake word and obeys. That last one has a human version. Someone mentions in passing that the garage is a mess, and a week later a teenager has spent Saturday clearing it, or a coworker has rebuilt a report because of one offhand remark at lunch. Words land as instructions far more often than we intend, especially from parents and bosses. The set in the dark was only doing what it thought it heard.
Depending on how you saw it
After a power outage
When the electricity comes back after an outage, some sets return to whatever state they were in, so a TV that was on when the lights failed switches on again, sometimes hours later. Which unfinished thing in your life starts up again the moment conditions allow?
In the middle of the night
Smart TVs often download updates overnight in standby, and some light up briefly while they do it. A glow from the living room at 2 a.m. is most likely maintenance. What work goes on in your home at night that you only notice when it makes a sound?
At the same time every day
A TV that wakes at the same minute every day is often following an on-timer set long ago, for a news program or a morning alarm, and then forgotten. The set keeps the appointment faithfully. Which arrangement did you set up once and forget that still works on your behalf?
Why it happens in nature
Modern TVs can be switched on by other devices through HDMI-CEC, a feature that lets a game console, cable box or streaming stick wake the set; manufacturers sell it as Anynet+, Bravia Sync or SimpLink. Power-on timers, overnight updates, a stuck remote button and smart speakers that mishear a wake word are other common causes.
To reflect on
Which offhand remark of yours did someone recently treat as a request?