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Rosenthal put the elements of the syndrome together based on thousands of questionnaires and observed common symptoms, which he describes as "an increased need for sleep; difficulty waking up in ...
Symptoms of winter SAD often include falling asleep earlier or in less than 5 minutes in the evening, oversleeping or difficulty waking up in the morning, nausea, and a tendency to overeat, often with a craving for carbohydrates, which leads to weight gain. [14]
A 2002 study of older adults (age 40–65) in San Diego found 3.1% had complaints of difficulty falling asleep at night and waking in the morning, but did not apply formal diagnostic criteria. [63] Actimetry readings showed only a small proportion of this sample had delays of sleep timing. [citation needed]
Bright light, particularly in the morning, is key for keeping your circadian rhythm on track. Studies have shown that exposure to natural light early in the day can improve sleep quality ...
However, for a sleep phase delayed person, the time of biological morning and biological afternoon/evening might differ depending on the circadian clock shift in the affected person. This means that if melatonin is taken during the usual bedtime and wake-up time (i.e., usual nighttime), it may have no effect.
If you have trouble falling asleep, wake up throughout the night or wake up feeling tired despite sleeping enough hours, these could be signs of an underlying problem or sleep disorder, the ...