Randomized clinical trial to evaluate the effect of vascular photobiomodulation on sleep quality, relaxation and stress when compared to placebo.

The quality of sleep is directly linked to the quality of human life. Irradiation of blood in the transcutaneous vascular technique is believed to decrease blood viscosity and platelet aggregation; activates superoxide dismutase; promotes increased oxygen content and stimulates microcirculation, it also stimulates increased serotonin production and cortisol reduction. Serotonin functions include sleep initiation, mood improvement, anxiety and depression. Therefore, the objective of the present project is to evaluate the effect of ILIB on salivary biomarkers related to stress and sleep. Therefore, participants with problems related to sleep quality will be selected and divided into 2 groups, group 1 undergoing ILIB Therapy twice a week for 30 minutes and group 2 the same frequency and time of application, but with placebo equipment. At the end of 10 sessions, salivary biomarkers related to stress and sleep and the patients' perception will be evaluated through specific questionnaires on the effect of ILIB on sleep, stress and relaxation.

Inclusion Criteria:

• poor sleep quality.
• Participants who for at least six months have had poor sleep quality (score > 5 points), measured using the PSQI,

Exclusion Criteria:

• use medications or perform treatments that may affect the sleep cycle
• treatment for hypertension
• asthma,
• attention deficit disorder,
• diabetes.

The photobiomodulation application devices are identical in both groups and in the placebo group the device will not emit light, only the sound signal. Both participant and researcher will wear protective eyewear and will not know which equipment is the active or placebo. Only a researcher external to the procedure will know which equipment is in each group