Examples of biphasic sleep are day and night sleep in the same day or waking up before going back to sleep at night. Sometimes such a dream can be beneficial to health. For example, for young children and those living in hot areas, daytime sleep is particularly important. Daytime sleep is known to improve concentration and performance, support immunity, mental health, and reduce stress levels.
But in general, daytime naps are not suitable for everyone. It can lead to sleep inertia (i.e., a sluggish state upon waking) and make it difficult to fall asleep at night. Therefore, for those who suffer from insomnia, it is better not to sleep during the day.
And if we talk about night wakings, then before the industrial revolution, sleeping twice a day was generally considered the norm. So, for example, go to bed at 9-10 in the evening, then wake up 1-2 hours after midnight and fall asleep again until the morning.
Source: Ferra
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