Wintertime tiredness is often caused by a disruption in the circadian rhythm and an increase in melatonin synthesis, which causes people to nap more. Reduced sunshine may induce Seasonal Affective Disorder (SAD), which can lead to exhaustion and a desire for more sleep. Additionally, the body conserves energy in colder climates, which makes people drowsier.
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Lifestyle modifications including increased exposure to natural light, exercise, and a nutritious diet might assist if taking naps often interferes with day-to-day functioning. Modalert 200 mg Australia (modafinil) may help increase alertness and encourage wakefulness in cases of chronic excessive drowsiness. To find out whether it's right for you, speak with a doctor.