Two upgrades just shipped to the ToolPico Sleep Calculator, and both grew directly out of ideas we'd floated in earlier posts: a sleep-cycle timeline that draws your calculated night as light, deep, and REM blocks instead of a list of clock times, and a 7-day sleep log that replaces the single weekly-average sleep-debt number with a small bar chart. Here's what each one does and how to read it.
The new sleep-cycle timeline
Short answerEvery calculated result — bedtime, wake-up time, "if I sleep now," or duration — now comes with an inline diagram beneath it: a horizontal strip broken into colored segments representing light sleep, deep sleep, and REM across each 90-minute cycle of your calculated night.
An earlier post on this blog described a timeline idea as a "natural next step" for a cycle-based tool without it being built yet. It's built now. Say, as an example, you use the "What time should I sleep?" tab and enter a 6:30 AM wake-up. The calculator lists candidate bedtimes as it always has, but under the recommended row it now renders a strip spanning the full calculated night, segmented cycle by cycle, with darker blocks marking deep sleep, a distinct shade for REM, and lighter fill for the light-sleep stretches in between. A small legend sits underneath so the colors are labeled, not just implied.
The point isn't new information — it's the same 90-minute-cycle estimate the calculator has always used, just made visual. Reading "6 cycles" as a shape you can scan, rather than only a number, makes it easier to notice things like how REM segments tend to lengthen in the later cycles of the night, which is part of why the last stretch of sleep before an alarm matters for feeling rested.
Worth remembering: the timeline is a model built from the standard 90-minute average, not a reading of your actual brainwaves. If you want measured sleep stages, that requires a wearable or a clinical sleep study; this diagram is a planning aid for timing bedtimes and wake-ups, same as the rest of the calculator.
The 7-day sleep log and bar chart
Short answerThe sleep-debt tool has been upgraded from a single weekly-average figure to an optional 7-day log: enter each night's bedtime and wake-up time for the past week, and the tool draws one small color-coded bar per night side by side, plus a running 7-day total.
A previous article on this blog argued that a single weekly average can hide the shape of a week — six solid nights and one very short one can average out close to seven mediocre nights, even though the two situations feel completely different. That argument was the case for building exactly this feature, and now it's live: open the "Log a full week instead (7-day sleep log)" section under the sleep-debt tool, fill in seven bedtime/wake-up pairs, and tap "Calculate 7-day debt."
What comes back is a compact bar chart, one bar per night, color-coded against your selected age group's recommended range: bars that reach target read as on-track, bars that fall a bit short are flagged in an intermediate color, and bars well under target stand out in a stronger warning color. As a purely illustrative example — not a real log — imagine four nights near 7.5 hours, one night at 8.5 hours after a weekend lie-in, and two nights around 5.5 hours during a busy week; the chart would show five steady green-ish bars flanking two shorter, flagged ones, which is a pattern a single averaged number would have smoothed away entirely.
Nothing is required to enable it: the classic single weekly-average view is still the default. The 7-day log lives in its own expandable section, so it's there when you want the detail and out of the way when you don't.
Using both together
These two features answer different questions, and they're meant to be used together rather than as alternatives. The timeline answers "what does tonight's sleep look like, cycle by cycle?" right after you calculate a bedtime or wake-up time. The 7-day log answers "what did this week actually look like?" after the fact, once you've got a handful of nights to compare. Neither replaces the core bedtime/wake-up math the calculator has always done — they sit alongside it as ways to see the same 90-minute-cycle model from two different angles: one night in detail, or seven nights side by side.
If you're logging a week, a workable routine is to jot down actual bedtime and wake-up time each morning, run that single pair through the duration mode to see its timeline, and then once you have seven entries, drop them all into the 7-day log to see the week as a whole. Small habit, but it turns "I feel tired" into a picture you can actually point to.
Frequently asked questions
What does the new sleep-cycle timeline actually show?
After you calculate a bedtime, wake-up time, or duration, the calculator now draws a horizontal strip beneath the result showing each 90-minute cycle broken into light, deep, and REM segments, colored differently and labeled with a small legend. It's an estimate built from the same 90-minute average the calculator has always used, not a measurement of your actual brain activity.
Do I need to turn the timeline on, or does it just appear?
It appears automatically. Once you tap Calculate in any of the four modes (bedtime, wake-up time, sleep now, or duration), the timeline renders inline under the corresponding result, matched to the number of cycles that result represents. There's no separate toggle or settings step.
How is the new 7-day sleep log different from the old sleep-debt tool?
Previously the sleep-debt tool worked from a single weekly average number. It's now upgraded to a 7-day log: you enter bedtime and wake-up time for each of the last 7 nights, and the tool renders a small color-coded bar for every night side by side, plus a 7-day debt total, instead of folding the week into one figure.
What do the bar colors mean in the 7-day log chart?
Each night's bar is shaded relative to your age group's recommended sleep range: a bar that reaches or exceeds your target reads as on-track, a bar that falls modestly short is flagged as a mild shortfall, and a bar well under target is flagged as a larger shortfall. Reading the colors left to right shows the shape of your week, not just its average.
Can I still get a single number instead of the full week view?
Yes. The original single weekly-average sleep-debt calculation is still available as the default view; the 7-day log sits in an expandable section labeled to log a full week instead, so you can use whichever level of detail fits the moment.
Methodology note: This article describes features confirmed present in the current version of the ToolPico Sleep Calculator (inline sleep-cycle timeline and 7-day sleep log with bar chart). Numeric examples describing a hypothetical week's sleep pattern are clearly labeled as illustrative, not real data. Both the timeline and the log are estimates based on the standard 90-minute sleep-cycle average, not measurements of actual sleep stages. This is general informational content, not medical advice — if you have ongoing insomnia, snoring, sleep apnea symptoms, or excessive daytime sleepiness, please talk to a doctor or sleep specialist.