Brief summary
The goal of this clinical trial is to investigate the effects of theta BWE combined with natural sounds on sleep quality in healthcare shift workers. The main questions it aims to answer are:
* Does theta brainwave entrainment (BWE) in combination with natural sound improve the sleep quality based on the Pittsburgh Sleep Quality Index (PSQI) score?
* Does theta BWE in combination with natural sound change theta power based on quantitative electroencephalography (qEEG)?
Researchers will compare theta BWE combined with natural sound to a BWE audio at a sham frequency to see if theta BWE improves sleep quality.
Participants will:
* undergo baseline assessments, including the PSQI questionnaire and a quantitative Electroencephalography (qEEG), before intervention is given.
* receive theta BWE binaural beats (intervention group) or BWE audio at a sham frequency (control group) for 20-30 minutes daily for 14 days.
* be re-measured on the PSQI questionnaire and qEEG assessment after the intervention period.