Cortisol is a hormone that presents ritmicity, with higher levels in the morning and lower levels at night. Alterations in the amounts and ritmicity of cortisol production are mainly due to chronic distress. We evaluate the cortisol levels from undergraduate students from two different studies in development in Labeest. Samples were taken in different moments: in the morning and before sleep. The students show ritmicity in cortisol production, with lower levels at night.