Congratulations. You made it through the first night. Some creatures will proceed to become more passive, while others will become more aggressive.
After the second night, you will see a small red creature. The second you do, run into the closest lockable room, lock yourself inside, and pray the thing didn't see you.
Along with this new creature, comes more rules.

Rule 6: Keep hold of your childhood toy if you have to leave a room with a nightlight. It won't save you from the creature, but it will keep it from being able to attack you as long as you hold it tight.

Rule 7: If grandma asks you to watch TV with her, don't just play on your phone or whatever, actually listen. The TV holds a lot more than just the weather now.

Rule 8: Just remember, if you wake up and the Moonman tries to attack you, it's one of your nightmares. Take your medicine, it'll help you stave them off. Just don't take too much.

Rule 9: Please refrain from eating the candy in grandma's purse. I don't know exactly where it comes from, but whatever it is it's certainly not strawberry anymore.

Rule 10: If you have to go outside at night, don't put on shoes, it'll keep the moonman from thinking you're trying to escape, but rather sleepwalking.

And, please listen to grandpa's stories. Maybe it'll give you a bit of a hint of what might happen on your birthday...