option vote
15 minutes or less 1912
20 minutes 1009
Slightly more than or less than 20 minutes (21, 22, 17, 18, etc) 994
30 minutes 1004
40 minutes (this length is suggested by polyphasicsociety.com for some Uberman variants) 971
60 minutes 318
90 minutes 373
Any lengths between 45 and 90 minutes 327
Any lengths between 45 and 60 minutes 341
Any lengths between 45 and 90 minutes 326
My sleep schedule is random. Sometimes I nap for 20 minutes, sometimes 40 minutes. Dawn or dusk does not matter to me. 305
My sleep schedule has different nap lengths (30 minutes around noon, and 20 minutes at dawn) 330
I hate naps. I don't understand how all these naps can work! 358
I would prefer a schedule with core sleeps only. I always oversleep in short naps 384
I don't have any difficulties napping for whatever duration (20 minutes in Biphasic, and later 90 minutes in Triphasic) 308

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