All participants will first be measured before and after their first night's duty to determine the baseline level of the accepted variables. Subsequently, the subjects will be informed not to use any additional forms of relaxation, and after four weeks, the study participants will undergo a final measurement.

Breathing training in the experimental group will be carried out under controlled conditions, in a quiet room, using VR goggles and the Flowborne VR - Biofeedback Breathing Meditation application. The goal of the program is to learn conscious breathing and reduce stress levels through an immersive virtual reality environment.

• A total of 8 sessions over 4 weeks.
• 2 trainings per week (after the end of night duty).
• Each session lasts 20 minutes.

Breathing training will be based on traditional relaxation methods using relaxation music. This program will be conducted under controlled conditions in a quiet room, without the use of VR technology.

• A total of 8 sessions over 4 weeks.
• 2 trainings per week (after the end of night duty).
• Each session lasts 20 minutes.

The Flowborne VR - Biofeedback Breathing Meditation game is an interactive training environment that guides the participant through a series of breathing exercises. The app adjusts the difficulty level and pace of the workout in real time based on the participant's physiological parameters, such as breathing rhythm.

Types of exercises in the game:

1. diaphragmatic breathing - the participant takes slow, controlled breaths, inhaling into the diaphragm and exhaling at a set pace. The game visualizes breathing through animations of water waves and background color changes.
2. rhythmic breathing - the participant sts his breathing rhythm to the changing visual and audio stimuli, allowing for synchronous breathing control.
3. Controlled exhalation lengthening - the participant learns the technique of slow exhalation of air to improve relaxation and reduce tension.

he MOXO Test is a computer-based diagnostic tool used to assess attention and impulse control. Participants respond to various visual and auditory stimuli appearing on the screen, where they must quickly and accurately recognize those that require a response while ignoring others designed to distract them. The test lasts approximately 15-18 minutes and evaluates four key indicators: reaction time, impulsivity, hyperactivity, and inattention. This allows for a detailed analysis of the participant's cognitive abilities and identification of potential attention deficits.

The assessment will be conducted using a standard, low, stable posturographic platform. The first measurement will be taken in an upright posture with an attempt to lean the body as far forward and backward as possible while maintaining stability. The second measurement involves standing on one leg.

The impact of the intervention on participants' sleep quality, particularly in the context of shift work, will be assessed using the Polish version of the Pittsburgh Sleep Quality Index (PSQI). This measurement will be conducted twice: before the first night shift and before the last night shift (Mollayeva et al., 2016).

Stress levels will be assessed using the PSS-10 Perceived Stress Scale (Cohen S., Kamarck T., Mermelstein R., 1983), adapted to Polish (Juczyński Z., Ogińska-Bulik N., 2009), which evaluates the intensity of stress related to one's life situation over the past month (Matuszczak-Świgoń et al., 2023). Additionally, the PANAS (Positive and Negative Affect Schedule) questionnaire will be used to measure participants' positive and negative affect, assessing the intensity of their emotions before and after the intervention (Piotr Brzozowski, 2019). Subjective mood and the intensity of its changes will also be evaluated using a 0-10 scale before each measurement.