You might think that suicide rates are highest in the dark, gloomy days of Winter, but recent studies found that too much Summer sunlight, like in the northern climes of Sweden and Greenland from April to August, can cause suicidal thoughts as well. Extended Summer days make sleeping difficult, disrupting the body's natural circadian rhythm where darkness triggers sleep. Quantity of sleep is connected to mental health, and continual sleep disturbances are linked to an increase in suicidal risk. Scientists found that in areas where the sun never sets for months, suicide rates increased dramatically, leading them to speculate that the imbalance of light and dark affects serotonin levels in the brain, the chemical linked to mood.
So as Summer approaches and the days become longer, be sure to follow your regular sleeping schedule. As you can see from this study, your physical and mental health depend on it.