Bedtime Stress Increases Sleep Latency and Impairs Next-Day Prospective Memory Performance

Area of Science:

• Cognitive psychology
• Sleep science
• Stress research

Background:

• Prospective memory (PM) is crucial for daily functioning, involving delayed intention execution.
• Previous research links healthy sleep to enhanced PM, but often uses unnatural sleep deprivation.
• The impact of common stressors like bedtime stress on PM remains unclear.

Purpose of the Study:

• To investigate if common bedtime stress affects next-day prospective memory performance.
• To examine the relationship between stress, sleep quality, and PM in an ecologically relevant context.
• To clarify inconsistent findings on stress and PM.

Main Methods:

• Forty young adults were assigned to either a stress or non-stress condition.
• Participants underwent stress induction or a control manipulation.
• Objective sleep quality was measured via polysomnography, followed by a PM task assessment.

Main Results:

• The stress group exhibited higher stress markers, longer sleep latencies, and poorer sleep depth.
• Participants in the stress condition showed significantly slower reaction times on the PM task.
• An interaction between stress exposure and increased sleep latency predicted poorer PM performance.

Conclusions:

• Bedtime stress, via heightened arousal, disrupts sleep processes.
• Sleep disruption following stress negatively affects attentional resource deployment for prospective memory.
• Everyday stressors like bedtime stress can impair cognitive functions reliant on sleep.