I used to think the hard part was the drive home.

The house was quiet in a way I didn't have a word for. Her bathroom light was still on. I couldn't bring myself to turn it off.

Everyone tells you she'll call every day. She didn't. By week two I was down to two-word texts. Fine. Busy. My husband said that's what we raised her to be, and he was right. I still checked my phone like it owed me something.

Nobody warned me about that part. She won't always call when it's hard. Not because she doesn't need me. Because she's eighteen, and she's learning to need me differently.

At a graduation party in June, another mom showed me a book she was filling out for her daughter. Sixteen letters. You write them before move-in and seal them, and she opens each one only when the moment printed on the front actually happens. Open your first night. Open when you bomb an exam. Open at 2am.

I told her the truth. I can't even write an Instagram caption about my daughter without crying. Sixteen letters felt like a job for a stronger woman.

Then she opened one and showed me. Every letter starts the sentence for you, and you finish it with one true line. The instructions actually say crossed-out words are allowed. Proof a real mom is supposed to write in it, not a card company.

So one Sunday morning I made a coffee and started with the funny ones, like the book tells you to. The recipe letter took four minutes. The secret was always more butter, and she is going to lose it when she reads that. The 8am letter made me laugh by myself at the kitchen table. Somewhere around the fourth letter I cried, but by then I wasn't scared of it. The whole book took me one coffee.

The 2am letter I saved for last. It's the one where you write what you'd say if she called you crying in the middle of the night, too far away to hug. The printed line at the top already says it for you:

see all sixteen printed lines →

The 2am will happen either way. The letter is optional.

In September, she had her night. I know because of what she sent me the next morning. A photo of the letter, seal torn open, and three words: "how did you know."

I slept through the hardest night of her first semester. And for once, that was okay.