{
  "slug": "how-much-sleep-do-i-need",
  "title": "How Much Sleep Do I Need?",
  "heading": "How Much Sleep Do I Need?",
  "category": "fitness-health",
  "url": "https://www.revenuelab.fyi/toolbox/how-much-sleep-do-i-need",
  "summary": "A 35-year-old adult needs about 7-9 hours of sleep a night, with 8 hours as the typical target.",
  "description": "Sleep needs vary primarily by age, with recommendations from the National Sleep Foundation ranging from 14-17 hours for newborns down to 7-9 hours for adults. This calculator maps your age to the recommended sleep range and, if given a wake time, computes ideal bedtimes accounting for 90-minute sleep cycles.",
  "formula": "Recommended hours are looked up by age band. Bedtime Options = Wake Time − (n × 90 minutes) − 15 min to fall asleep, for n = 4,5,6 cycles.",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=how-much-sleep-do-i-need",
  "inputs": [
    {
      "id": "age",
      "label": "Age",
      "kind": "number",
      "hint": null,
      "default": 35,
      "unit": "years",
      "min": 0,
      "max": 100
    },
    {
      "id": "wakeHour",
      "label": "Wake-up hour (24h)",
      "kind": "number",
      "hint": null,
      "default": 6,
      "unit": null,
      "min": 0,
      "max": 23
    },
    {
      "id": "wakeMinute",
      "label": "Wake-up minute",
      "kind": "number",
      "hint": null,
      "default": 30,
      "unit": null,
      "min": 0,
      "max": 59
    }
  ],
  "outputs": [
    {
      "id": "minH",
      "label": "Min recommended hours",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "maxH",
      "label": "Max recommended hours",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "bedHour",
      "label": "Ideal bedtime hour (24h, 5 cycles)",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "bedMinute",
      "label": "Ideal bedtime minute",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Age: 35 years",
      "Wake-up hour (24h): 6",
      "Wake-up minute: 30"
    ],
    "outputs": [
      "Min recommended hours: 7",
      "Max recommended hours: 9",
      "Ideal bedtime hour (24h, 5 cycles): 22",
      "Ideal bedtime minute: 45"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter age (years).",
      "Enter wake-up hour (24h).",
      "Enter wake-up minute.",
      "Read your min recommended hours on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "age": 35,
        "wakeHour": 4,
        "wakeMinute": 20
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "age": 35,
        "wakeHour": 6,
        "wakeMinute": 30
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "age": 35,
        "wakeHour": 10,
        "wakeMinute": 50
      }
    }
  ],
  "limitations": [
    "Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.",
    "Results do not account for medical conditions, medication, or pregnancy.",
    "Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it."
  ],
  "faq": [
    {
      "q": "How much sleep do I need?",
      "a": "A 35-year-old adult falls in the 18-64 age band, which is recommended 7-9 hours of sleep a night by the National Sleep Foundation, with most adults doing best around 8 hours."
    },
    {
      "q": "Why do sleep needs decrease with age?",
      "a": "Sleep architecture changes across the lifespan — infants and children need more sleep to support rapid brain and physical development, while older adults typically need slightly less total sleep though sleep quality often becomes more important."
    },
    {
      "q": "What are sleep cycles and why do they matter for bedtime?",
      "a": "A full sleep cycle is about 90 minutes; waking up mid-cycle (during deep sleep) causes grogginess, so timing bedtime to complete whole cycles before your alarm — typically 5 or 6 cycles — helps you wake up feeling more rested."
    },
    {
      "q": "Is more sleep always better?",
      "a": "Not necessarily — consistently sleeping well beyond 9-10 hours for adults has been associated in some studies with underlying health issues, so both too little and unusually excessive sleep can be worth discussing with a doctor."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/how-much-water-should-i-drink",
    "https://www.revenuelab.fyi/toolbox/how-many-hours-until-a-deadline"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — How Much Sleep Do I Need? (https://www.revenuelab.fyi/toolbox/how-much-sleep-do-i-need)"
}