I think I have a sensor problem

I slept horribly last night, so the long walk I'd been planning to do today might have to happen tomorrow. Am feeling discombobulated.* The light that sits right at my apartment's door (on the inside) has a motion sensor that triggers the light whenever I come in from outside or approach the light while I'm inside. If the apartment is dark (and depending on the time of day, it can be dark during the day), the door light (let's call it a "door light" and not an "anteroom light" since I have no anteroom) comes on. But for the past day or two, the door light, once it comes on, won't go off. Here's a YouTube Short I just made showing the problem. So this light, an LED lamp with no controlling switch aside from the circuit breaker, has been on all night for the past two nights.

I only just figured out a workaround that seems to work while the studio is dark. It doesn't solve the problem, which I think is a faulty sensor necessitating repair or replacement, but it seems to take advantage of the nature of the problem to solve it: I turn on my kitchenette light, which the sensor is still sensitive enough to register; the door light goes off when the kitchenette light comes on. I then turn the kitchenette light off, and the door light stays off. This means I can now sleep peacefully, but as I said, it doesn't really solve the sensor problem... or what I think is a sensor problem. Any clever commenters with possible solutions? I'm all ears. (And yes, I've been researching the problem online.)

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*I realize that people will read this blog post, with its long, complex sentences, and think back to Egon Spengler in "Ghostbusters" saying, "I'm terrified beyond the capacity for rational thought." So just how discombobulated can I be?