option vote
15 minutes or less 1895
20 minutes 989
Slightly more than or less than 20 minutes (21, 22, 17, 18, etc) 976
30 minutes 986
40 minutes (this length is suggested by polyphasicsociety.com for some Uberman variants) 955
60 minutes 301
90 minutes 356
Any lengths between 45 and 90 minutes 309
Any lengths between 45 and 60 minutes 323
Any lengths between 45 and 90 minutes 309
My sleep schedule is random. Sometimes I nap for 20 minutes, sometimes 40 minutes. Dawn or dusk does not matter to me. 287
My sleep schedule has different nap lengths (30 minutes around noon, and 20 minutes at dawn) 306
I hate naps. I don't understand how all these naps can work! 342
I would prefer a schedule with core sleeps only. I always oversleep in short naps 365
I don't have any difficulties napping for whatever duration (20 minutes in Biphasic, and later 90 minutes in Triphasic) 291

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