Memory encoding is impaired after multiple nights of partial sleep restriction.

Area of Science:

• Cognitive Neuroscience
• Sleep Science

Background:

• Adequate sleep is crucial for cognitive functions, including memory encoding.
• While total sleep deprivation's effects are known, the impact of consecutive nights of sleep restriction on memory encoding remains unclear.

Purpose of the Study:

• To investigate the effects of 5 consecutive nights of sleep restriction on memory encoding in adolescents.
• To determine if sleep restriction impairs the ability to learn declarative information.

Main Methods:

• A parallel-group study involving 59 adolescents randomized into sleep-restricted (5h time in bed) and control (9h time in bed) groups for 5 nights.
• Participants completed a picture-encoding task, with memory assessed via recognition test after 3 nights of recovery sleep.

Main Results:

• Memory performance was significantly worse in the sleep-restricted group compared to the control group (P=0.001).
• The observed memory impairment was not linked to decreased vigilance levels.

Conclusions:

• Multiple consecutive nights of partial sleep restriction lead to a deterioration in memory encoding ability.
• This pattern of sleep deprivation negatively impacts adolescents' capacity for declarative learning.