Sleep Myths Debunked
Matt challenges the common belief in biphasic sleep, arguing that the evidence often cited is based on flawed studies. He highlights the artificial conditions of a 14-hour bed study and emphasizes the lack of clear separation in sleep patterns. Ultimately, he remains open to new findings but stresses the need for more robust research to support the notion of first and second sleep.In this clip
From this podcast

Huberman Lab
Dr. Matt Walker: How to Structure Your Sleep, Use Naps & Time Caffeine | Huberman Lab Guest Series
Related Questions
Is it true that the human body is designed to have two separate 4-hour sleep periods during the day rather than an 8-hour sleep period at a time?
Is it true that the human body is designed to have two separate 4-hour sleep periods during the day rather than an 8-hour sleep period at a time, as discussed in the episode Dr. Matt Walker: How to Structure Your Sleep, Use Naps & Time Caffeine | Huberman Lab Guest Series and the clip Sleep Myths Debunked?
I remember that Dr. Huberman stated that there are 2 distinct phases of our circadian cycle upon waking, from 0 to 9 hours or something. Would like to know more about this.