Why this project exists
Many sleep calculators show a single answer with very little explanation. That can be useful, but it also hides the fact that sleep timing varies. Sandy is built around a different idea: show several options, explain the assumptions, and let the user decide what fits their real schedule.
What the site is
- A free browser-based sleep-cycle planning tool.
- A small library of source-linked explanations about sleep cycles and sleep duration.
- A privacy-first website that does not require an account.
- A project designed to meet modern mobile, accessibility and advertising standards from the start.
What the site is not
- It is not a medical device.
- It does not diagnose or treat a sleep disorder.
- It does not measure actual sleep stages.
- It does not claim that a calculator can replace a clinician.
- It does not sell a perfect sleep schedule.
Editorial approach
Content is written for a general audience, checked against public health and sleep-science sources, and updated when the method or source material changes. The site distinguishes between a general planning model and a person's actual health situation.
AI-assisted drafting may be used as a tool, but published pages are reviewed for accuracy, clarity and relevance. The site does not publish auto-generated pages at scale. See the editorial policy for details.
Who operates the site
Sandy is an independent developer operating this website. Read the author profile for the project scope and editorial boundaries. Questions, corrections and accessibility feedback can be sent through the contact page.
How to contact the project
Use the contact page for corrections, accessibility feedback or general questions.