Polyphasic sleep
Polyphasic schedules, honestly compared.
Most “sleep less, do more” schedules don’t survive contact with real-world physiology. The biphasic siesta does. The rest are mostly interesting experiments. Here’s what each one is and what the evidence says.
Schedules
Everyman
4h total · 4 blocks · hard
One 3-hour core sleep at night plus three 20-minute naps. Most adopted polyphasic pattern outside research labs.
Uberman
2h total · 6 blocks · extreme
Six 20-minute naps every 4 hours. Not supported by long-term research; reports of severe sleep debt.
Dymaxion
2h total · 4 blocks · extreme
Buckminster Fuller's 4×30-min schedule. Two hours total per day. Extreme; not recommended outside short experiments.
Biphasic (siesta)
6.5h total · 2 blocks · moderate
Common Mediterranean pattern: 6-hour night sleep + 30-minute afternoon nap. Closest polyphasic option to documented health benefits.
What the research says
Extreme polyphasic schedules (Uberman, Dymaxion) restrict total sleep far below the 7–9 hour adult recommendation. Studies in sleep-restriction protocols show measurable degradation in attention, memory, and immune function after just two nights of sub-6-hour sleep — and that degradation is cumulative and largely invisible to the subject.
The biphasic siesta pattern is different. A 6-hour night block plus a 30-minute afternoon nap fits Mediterranean cultural patterns and aligns with documented health outcomes. Everyman sits somewhere in between — a few thousand self-experimenters report adaptation, but no long-term controlled trials support it.
Sources: Van Dongen et al., Sleep 2003 — cumulative cost of sleep restriction