Learn Turkish: Bu loş odada insan zaten mayışıyor. - In this dim room, one gets drowsy anyway.

It emphasizes that getting drowsy in this situation is an inherent or inevitable state. While the sentence without it just means "One gets drowsy in this dim room," adding zaten gives the flavor of "Naturally, one gets drowsy here" or "In a room like this, you're going to get drowsy anyway."

Why is insan used in the singular here to mean "one" or "people"?

In general statements, the bare noun insan acts as a generic pronoun. It is used exactly like the English impersonal pronoun "one" or the generic "you" to describe what happens to people in general under certain conditions.

What is the exact feeling described by the verb mayışmak?

Mayışmak is a very specific and common Turkish verb describing the feeling of becoming pleasantly sluggish, lethargic, or drowsy. It is usually triggered by warmth, a heavy meal, or a cozy environment like this loş room, rather than just being exhausted from hard work.

What is the difference between a loş room and a karanlık room?

Karanlık means fully dark, whereas loş means dimly or softly lit. A loş environment is often associated with relaxation, which perfectly sets up the inevitable drowsiness implied by zaten.