Daily associations between salivary cortisol and electroencephalographic-assessed sleep: a 15-day intensive longitudinal study.

ABSTRACT:

Study objectives

Current evidence suggests that cortisol levels are bi-directionally associated with sleep. However, the daily, naturalistic cortisol-sleep associations remain unclear, as current evidence is mostly cross-sectional. This study tested whether pre-sleep cortisol predicts sleep duration and quality, and whether these sleep parameters predict the following day's diurnal cortisol slope using a 15-day intensive longitudinal design with electroencephalographic measures and saliva sampling.

Methods

Ninety-five young adults (Mage = 20.48 ± 1.59 years) provided saliva samples at awakening and pre-sleep over 14 consecutive days, providing 2345 samples (85% viable). The Z-Machine Insight + was used to record over 900 nights of total sleep time (TST) and sleep efficiency

SUBMITTER: Yap Y 

PROVIDER: S-EPMC11381568 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature