Bed rotting — spending long awake stretches horizontal, scrolling or streaming — went viral as self-care, and sleep researchers immediately winced. The problem is not rest itself; it is that awake recumbency in dim light scrambles the two systems that keep you functional: your circadian clock and your musculoskeletal baseline.
Light is the master zeitgeber. A bright morning delivers 10,000+ lux; a bedroom with curtains drawn delivers 50–200. Spend enough awake hours at bed-level lux and your melatonin curve drifts later — the calculator estimates that phase delay directly. Meanwhile, lying awake burns roughly 1.0–1.3 METs, barely above coma-adjacent resting rate, and extended pressure loading raises tissue-inflammation risk after the 6–8 hour mark.
Enter a typical rot session and your weekly pattern. You get a Circadian Distortion Index from 0–100, a projected sleep phase delay in minutes, and a plain-language read on whether your current habit is a recovery ritual or a slow-motion physiological tax.
The formula
H_rot- Awake hours spent in bed per session
L_room / L_opt- Room lux relative to the ~1,000 lux daytime suppression threshold
MET_rot / MET_active- Metabolic rate while rotting (~1.05 MET) vs. normal daily activity
F_week- Rot sessions per week
S_screen- Proportion of the session spent on a screen
How it works, step by step
- Log the awake hours of a typical session — sleep does not count, only conscious horizontal scrolling.
- Estimate your room brightness: blackout-dark (≈50 lux), curtains drawn (≈150), bright window (≈1000+).
- Set your weekly frequency and screen share of the session.
- The model integrates lux deficit, metabolic suppression and frequency into the distortion index.
- Check the phase-delay estimate: every ~90 low-lux awake hours shifts your melatonin onset noticeably later.
Worked examples
The Sunday-only rotter
Ana rots one afternoon a week: 5 awake hours, curtains drawn, 90% phone. CDI ≈ 40 — Drift zone. Single sessions in dim light are recoverable; the model flags her ~30 min of accumulated weekly phase delay, cancelable with Monday-morning sunlight.
The semester-collapse pattern
Jae logs 7 hours × 5 days a week in a blackout room, zero exercise. CDI ≈ 83 — Full decompression, with a projected ~140 min/week phase drift and an elevated disuse flag. The model’s first recommendation: shift the same scrolling to a sunlit couch — identical rest, half the circadian cost.
How to read your score
Frequently asked questions
Is bed rotting actually bad for you?
Occasional short sessions are harmless and arguably restorative. The research concern is dose-dependent: long awake recumbency in dim light delays circadian phase, suppresses daily energy expenditure toward ~1 MET, and past 6–8 continuous hours raises pressure-related tissue risk.
What is a circadian phase delay?
It is your internal clock drifting later: melatonin starts rising later at night, making sleep onset and natural wake time later. Dim-light awake hours are a primary driver because your clock calibrates to the brightest sustained light it sees.
How is this different from a sleep calculator?
Sleep-cycle calculators optimize when to sleep. This tool models what awake time in bed does to your physiology — the two are complementary.
Can I offset bed rotting with exercise?
Partially. Regular training preserves muscle and bone against disuse and modestly stabilizes circadian rhythm — the calculator credits your exercise days — but it does not replace morning light exposure.
Why does screen time matter if I am resting anyway?
Screens hold your light exposure at face-level lux (dim) while delivering alerting content, the worst combination: your clock reads “cave” while your brain reads “stimulated.” Blue light at night is a secondary, smaller effect.
Is my data stored?
No — the calculation runs entirely in your browser.