minecraft-assets/assets/minecraft/advancements/adventure/sleep_in_bed.json

{
    "display": {
        "icon": {
            "item": "minecraft:bed"
        },
        "title": "Sweet dreams",
        "description": "Change your respawn point"
    },
    "parent": "adventure/root",
    "criteria": {
        "slept_in_bed": {
            "trigger": "minecraft:slept_in_bed"
        }
    }
}