The sleep calculators
Six free tools that work as one system. Two of them tell you what your body wants; one turns that into a schedule; the rest fix what knocks it off course. Start anywhere — they all link to each other.
Free · No sign-up · Built by the Moongreens Sleep Lab
Before you can set a schedule, you need two answers: when your biology wants to sleep, and how much sleep you need. These are the inputs everything else runs on.
Chronotype
Lark or night owl? Find the sleep window your body is wired for — the single thing that decides whether a bedtime feels natural or like a fight.
CalculatorHow Much Sleep?
A personalised nightly target from your age, training load, stress and cycle — not the generic "eight hours" that fits almost nobody exactly.
Your chronotype and your sleep need both feed into one place: the times to actually go to bed and wake up, landed between sleep cycles so you wake clear.
Even a good schedule gets derailed. These two cover the usual suspects: the debt you build when you miss the window, and the afternoon coffee and evening wine that stop you hitting it.
Sleep Debt & Naps
See how much sleep you're carrying, what it's quietly costing your focus and reaction time, and the nap length that actually helps instead of leaving you groggy.
Two calculatorsCaffeine & Alcohol
Find out how much caffeine is still in your system at bedtime, when to stop drinking, and how a nightcap quietly splits your night in two.
A temporary disruptor rather than a daily one. Reset fast, then feed straight back into your normal bedtime.
The tools tell you when. Moongreens helps you get there.
Every one of these points at the same thing: the sleep you want only counts if you can actually fall into it and hold it. Moongreens is a melatonin-free night drink built to support your own wind-down, so the schedule these tools hand you is one you can keep.
It leans on named clinical forms rather than a sedative hit, and on 5-HTP to support your own melatonin pathway rather than dosing the hormone itself. Made in the USA.
90 nights, money-back. Thirty nights isn't long enough to judge a recovery formula, so you get three months to feel the difference in how you wake up.
These tools are for general guidance and aren't medical advice. Sleep needs vary, and ongoing trouble sleeping is worth a conversation with your doctor. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.