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Updated: Mar 6, 2026

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila

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Published on: December 14, 2020

Social jet lag: Sleep-corrected formula.

Konrad S Jankowski¹

¹a Department of Psychometrics and Psychological Diagnosis, Faculty of Psychology , University of Warsaw , Warsaw , Poland.

Chronobiology International

|March 21, 2017

Summary

Social jet lag, the mismatch between social and biological time, may inaccurately reflect sleep debt. A new sleep-corrected formula is proposed to better measure this misalignment and improve sleep health understanding.

Keywords:

MCTQ chronotype circadian misalignment morningness-eveningness sleep sleep debt sleep deprivation social jetlag

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Last Updated: Mar 6, 2026

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Published on: December 14, 2020

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Area of Science:

Chronobiology
Sleep Science
Public Health

Background:

Social jet lag describes the misalignment between an individual's sleep schedule and the 24-hour day.
Current social jet lag calculations may conflate this misalignment with sleep debt from insufficient sleep during workdays.

Purpose of the Study:

To propose a refined formula for social jet lag that accounts for sleep debt.
To differentiate between social jet lag and actual sleep deprivation.

Main Methods:

Analysis of existing social jet lag formulas.
Development of a sleep-corrected social jet lag formula based on sleep onset and offset differences between workdays and free days.

Main Results:

The current social jet lag formula may include sleep debt, not just temporal misalignment.
A sleep-corrected formula is proposed, considering specific sleep patterns on workdays versus free days.

Conclusions:

The proposed sleep-corrected formula offers a more accurate measure of social jet lag.
This refinement can lead to better understanding and management of sleep-related health issues.