Biphasic sleep is built into our sleep rhythms. There is a longer, deeper sleep period at night, and a shorter, lighter sleep period at the opposite time of the

Biphasic sleep is built into our sleep rhythms. There is a longer, deeper sleep period at night, and a shorter, lighter sleep period at the opposite time of the day (2-3 pm). This is more or less prevalent for different people, and you don't NEED to nap, but it certainly is not unusual.