The right answer is False (its the vision).
Drowsiness is a symptom that results in a strong desire to sleep. It is normal, "physiological", when it occurs in the evening or at the usual bedtime, or in the early hours of the afternoon. If it occurs during the day, we talk about daytime sleepiness. While drowsiness can affect everyone, especially when tired, after a bad night or just after a big meal, it becomes abnormal when it is repeated daily, alters attention and interferes with daily activities.
Signs of sleepiness are:
• tiredness, want to sleep, feeling weak
• vertigo (head that "turns")
• vision disorders (blurred vision, poor appreciation of distances, difficulties to see when night falls ...)