It should be noted that, as in the past, the SARS-CoV-2 virus will continue to mutate.1 Today, one type of SARS-CoV-2 that is a rapidly spreading concern in the United States is B.1.617.2,1 which is called deltacoronavirus. The risk of hospitalization in people infected with the delta type of SARS-CoV-2 has doubled compared to the alpha type,2 which is a reason for the increased anxiety of medical staff. In the one hand, long-term anxiety during the outbreak of COVID-19 causes psychological stress in health care professionals, which may lead to poor sleep quality.3 It is clear that sleep patterns are related to mental health. Sleep quality has a two-way relationship with stress, anxiety and mood swings. On the other hand, sleep disorders exacerbate psychological distress; Anxiety also disrupts normal sleep habits.4,5 It has also been proven that anxiety negatively affects the quality of sleep.6 Therefore, it can be acknowledged that even the psychological effects of Covid-19 vaccination can be altered, and the stress of the Deltacoronavirus epidemic can affect the performance of Covid-19 vaccines. due to the changes in the effectiveness of Covid-19 vaccination, the medical staff becomes stressed again and consequently their sleep quality changes. COVID-19 and subsequent measures to control it can directly or indirectly alter sleep quality. Many psychological dimensions can play an important role in this regard.7 Therefore, it can be acknowledged that with the onset of the deltacoronavirus epidemic, the incidence of the disease has increased and subsequently the admission of patients to hospitals has increased and puts additional pressure on health care professionals. Considering that the effectiveness of vaccinations against deltacoronavirus has decreased; Health care providers are more vulnerable and may become infected with this dangerous virus. Contrastingly, it has been shown that stress and loneliness (quarantine) can disrupt the immune system's response to vaccines.8 Thus, unfavourable psychological conditions reduce the effectiveness of Covid-19 vaccination, and this reduction can also negatively affect the level of anxiety and ultimately the quality of sleep of health personnel. In addition to vaccination, it is recommended to adopt care strategies and implement them carefully to create maximum immunity.
Authors’ contributionsStudy conception and design, study supervision: Amirmohammad Merajikhah.
Analysis and interpretation of data: Atefeh Beigi-khoozani.
Acquisition of data: Mahdieh Soleimani.
Funding of resourcesNo funding was received.
Conflict of interestNone.
