The Glass Should Be Empty by Morning

The glass of water beside your bed should be empty by morning.

That's what my grandmother always said. Not in a warning tone — more like a reminder, the way she'd tell me to brush my teeth or leave my shoes by the door. The glass should be empty by morning. I nodded the first few times she said it and forgot about it the same way I forgot everything she told me when I was eight.

I remembered it last Tuesday.

I'd been living alone in the apartment for about six weeks when the insomnia started. Nothing dramatic — I'd just lie awake until two, three in the morning, watching the ceiling, listening to the pipes. My doctor said it was the new city, new job, new everything. She suggested warm milk and no screens after ten, the usual script. I bought a sleep mask. I downloaded a white noise app. I put a glass of water on the bedside table because somewhere I'd read that waking up thirsty was one reason people slept badly.

The first night I noticed it, I thought I was imagining things.

The glass was full when I set it down. In the morning it was still full — not almost full, but full to exactly the same level, the little lip of water right at the brim. I had a vague memory of reaching for it around 3 a.m., but maybe I'd dreamed that. I poured it down the sink, refilled it, went to work.

Same thing the next morning.

I told myself I simply hadn't been thirsty. Stress can dehydrate you or not dehydrate you, I didn't actually know how any of it worked. I started paying closer attention. I set the glass down each night and made a small mental note of the water level — not quite full, a centimeter below the rim, where I'd poured it. Each morning it was back at the brim.

Not overflowing. Not spilled. Just full.

It was a Friday when I asked my landlord, Mrs. Calloway, about the apartment's previous tenants. I told her I was just curious, new-person small talk. She gave me a look I couldn't quite read and said the last tenant had stayed only four months, which was unusual for that unit. People usually renewed. When I pressed, she said the tenant — a man named David, she thought, mid-thirties — had moved out quite suddenly. He'd seemed fine up until the last week, then he'd called her one morning and said he needed to leave that day, and he'd left that day.

I asked if she knew why.

She said he'd mentioned not sleeping well.

That night I set up my phone to record the bedroom while I slept. The angle was bad — I propped it against a book on the dresser and it mostly caught the ceiling and the top half of the room. I fell asleep around midnight, which was early for me lately.

In the morning I sat on the edge of the bed and watched twenty minutes of footage at double speed, the ceiling gray and still.

At 3:17 a.m. the recording showed me reaching for the glass.

I watched myself lift it, tilt it toward my mouth, pause — the way you pause when you've just woken up and you're moving mostly on instinct — and then set it back down without drinking. I put it back exactly at the brim. Then I lay down and did not move again.

The thing is, I sleep on my right side facing the wall. The glass is on my left.

I called my grandmother that afternoon. She's 83 and lives alone in the house where my mother grew up, and she still answers on the second ring.

I told her about the glass, the recording, David the previous tenant. I heard her breathe for a moment before she spoke.

She said she didn't know exactly what it was. Her own grandmother had told her it was something that found empty places — empty apartments, empty hours, the space between sleeping and waking. It didn't mean harm, her grandmother had said, but it was hungry, and thirsty things fill themselves from whatever is nearby.

"The glass should be empty by morning," she said, "because if it isn't, something else drank first."

I asked her what I should do.

She told me to drink the whole glass every night, down to the last drop, before I closed my eyes. Never leave it full. It would find the glass full and find nothing else to take.

"Did it ever take anything from David?" I asked.

She didn't answer that question.

I drink the glass now. Every night, the whole thing, before I turn off the light. I fall asleep faster, actually — I don't know if that's connected or if I'm just tired enough. I haven't watched any more recordings. I told myself I would delete the one from before, and I haven't done that either. It's still on my phone.

I've watched it a few more times.

What bothers me — what I keep coming back to, lying here in the dark — is not the arm reaching across the bed in the wrong direction. It's the pause. That half-second where I hold the glass at my lips and don't drink.

Like I'm waiting.

Like something is deciding.