Odds Ratio Product (sleep depth)
orp0.160-2.5
Continuous sleep depth on a 0–2.5 scale, derived from deciles of 3-second EEG band power. Low is deep, high is awake — it resolves gradations inside a single scored stage.
Live demo
A scored night, as Beacon sees it
One real recording, scored by a human technician, run through the engine. Every number on this page is read from the engine’s output file. Nothing here is illustrative.
Recording
Total sleep time
5h 27m
ngt_sc4001e0 · 7.0h recorded · 30s epochs
- Sleep efficiency
- 77.6%
- WASO
- 34m
- Onset latency
- 30m
Five states, and the signal underneath them
The hypnogram is what a human technician wrote down: one of five labels per epoch. Underneath it, on the same axis and the same minute, is what the EEG was actually doing. Structure the five-state scoring flattens — a shallowing N2, an arousal that never reached wake — stays visible in the continuous series.
- Scored stage
- REM
- ORP depth
- deep 0 → 2.5 awake
One shared time axis, ticked in h:mm elapsed from lights out. Above: the technician’s five-state scoring, one step per 30-second epoch. Below: Odds Ratio Product, a continuous 0–2.5 depth estimate — low is deep, high is awake. The colour strip is the same ORP series binned to the plot’s own pixel resolution (mean of real samples per bin); bins with no valid sample are left empty rather than filled. Unscored epochs and null samples break the line instead of being interpolated.
841 scored epochs · 841 valid ORP samples of 841
Stage architecture
How the night divides across the five scored states.
22%
15%
30%
26%
- Wake
- 1h 34m
- 22.4%
- REM
- 1h 03m
- 14.9%
- N1 · transitional
- 29m
- 6.9%
- N2 · light
- 2h 05m
- 29.7%
- N3 · slow-wave
- 1h 50m
- 26.2%
Percentages are of 7h 01m of scored recording. Depth stages share one hue stepped by depth; REM carries the only second colour because it does not sit on that continuum.
Signals returned for this night
Each card names the paper it implements. Where a metric cannot be computed from this input, the card says so and says why — it is never rounded down to zero, and it is never estimated.
Sleep spindle density (N2)
spindle_density0.79spindles/min
Sleep spindles detected per minute of N2 sleep.
Coverage100.0%
Lacourse et al., J Neurosci Methods 2019;316:3-11 (A7)
doi:10.1016/j.jneumeth.2018.08.014Slow-wave activity decay (Process S)
swa_decay-0.11log10(uV^2)/hour
The overnight dissipation rate of delta power across successive NREM periods — the discharge of Process S in the two-process model.
Wake-bout power-law exponent
transition_dynamics1.43alpha (dimensionless)
The power-law exponent of wake-bout durations across the night (reference value ~1.3), reported alongside stage-transition entropy.
Sleep Regularity Index
sri68.40-100
Percent concordance of sleep/wake state at time points 24 hours apart, rescaled to 0–100. It is measured across multiple consecutive days of recording rather than within a single night.
Coverage92.0%
Phillips et al., Sci Rep 2017;7:3216; Windred et al., SLEEP 2024;47(1):zsad253
doi:10.1038/s41598-017-03171-4Provenance
These are real polysomnography recordings from Sleep-EDF Expanded, published by PhysioNet. The hypnogram is the original scoring by a human sleep technician, not a Beacon prediction — Beacon computes the signals plotted against it. No values on this page are simulated, smoothed for presentation, or filled in.
- Engine
- beacon-0.1.0
- Nights in file
- 5
- Generated
- 2026-07-29T19:38:29.464438+00:00
- Source
- PhysioNet