I will only add that it is incorrect to talk about the absence of the sun in cloudy weather. The sun's rays are really scattered more when the sky is covered with clouds, however, even this radiation and its reflection from surrounding objects is enough to "blind" a person so much that it irritates the nervous system and you start to squint.
already this "sufficiency" of radiation is formed under various physiological factors, including: the state of the organism, genetics, etc. In short, if you are blinded in cloudy weather, then you should not immediately diagnose yourself, perhaps you just did not get enough sleep or were tired and this fatigue is not necessarily chronic. I explained somewhat clumsily terminologically, but I hope it’s clear. If I’ve made a mistake, please correct it.
taking drugs without proven effectiveness, even from a medical student. university should not be taken as a recipe.
There are already two of us, at least;) I always have such a shnyaga at the end of the semester. In science, this is called hyperesthesia - hypersensitivity. The work of our nervous system consists of two processes - excitation (reaction to a stimulus) and inhibition (suppression of the reaction). Both processes require active work and energy consumption, and when the nervous system has no strength left, inhibition cannot be carried out in an adequate volume, therefore, too much reaction develops to each stimulus. This is hyperesthesia. Its most common cause is long-term mental overload - study, work, solving difficult, emotionally significant personal problems, conflicts, both interpersonal and intrapersonal, etc. In this position, you need to be very careful, because this is a sign of developed neurasthenia. To get out of this state, it is necessary to eliminate stress and all mental work for a certain time as much as possible and take some drugs - neuromultivit, piracetam, etc. In severe cases, it is necessary to work with a psychotherapist and individual selection of drugs.