Sleep tools

Five things you can work out in under a minute.

• Sleep disorder questionnaire

  Nineteen questions about how you've been sleeping, and which of your answers are worth taking to a doctor. Not a diagnosis, and it says so.

• Sleep debt calculator

  Add up the last seven nights against what you need, and see the shortfall you're actually carrying.

• Bedtime and wake-time calculator

  Work back from your alarm — or forward from lights-out — to times that land on a sleep-cycle boundary.

• How much sleep do I need?

  The recommended range for your age, and what the range does and doesn't mean.

• Sleep schedule shift planner

  A day-by-day plan for moving your bedtime to where you want it, without moving it all at once.

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