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Sleep restriction increases reward sensitivity during sequential updating.

Jeryl Y L Lim^1,2, Daniel Bennett^1,3, Sean P A Drummond^1,2

¹School of Psychological Sciences, Monash University, Melbourne, Victoria, Australia.

|November 9, 2025

Summary

This summary is machine-generated.

Chronic sleep restriction (SR) impairs decision-making by increasing reward-chasing behavior and reducing goal-directed choices. This impacts how individuals learn and adapt in uncertain environments, affecting real-world performance.

Keywords:

Bayesian decision making reinforcement learning sequential updating sleep restriction

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Area of Science:

Cognitive Neuroscience
Behavioral Economics

Background:

Chronic sleep restriction (SR) is prevalent, yet its effects on learning and adaptation in uncertain environments are unclear.
Understanding how SR impacts sequential updating—revising beliefs based on feedback—is crucial for cognitive function.

Purpose of the Study:

To investigate how SR affects cognitive mechanisms of sequential updating.
To determine the impact of SR on learning and behavioral flexibility in response to changing reward contingencies.

Main Methods:

36 healthy adults underwent two conditions: Well-Rested (WR) and Sleep Restricted (SR).
Participants performed a Probabilistic Reversal Learning Task (PRLT) on the final day of each condition.
Computational modeling (Asymmetric Rescorla-Wagner) analyzed feedback-driven learning rates.

Main Results:

Sleep restriction (SR) increased sensitivity to reward feedback and choice stochasticity.
Participants exhibited more reward-chasing behavior and less goal-directed decision-making under SR.
No significant difference in trial accuracy was observed between WR and SR conditions.

Conclusions:

SR alters decision-making by enhancing reward sensitivity and reducing goal-directed control.
Findings suggest potential dose-dependent effects of SR on cognitive processes.
Implications for decision quality in real-world scenarios requiring adaptive learning under uncertainty.