Sleep need would depend on individual chronotype rather than one fixed 8-hour number for everyone; waking at 3am would reflect a natural body-temperature spike, not a failure.

noli's read

The individual variation is real: Harvard's Division of Sleep Medicine confirms sleep need varies genetically from roughly 6 to 9 hours, and a few rare families carrying mutations (DEC2, ADRB1) naturally sleep 4-6.5 hours without sleep debt. Genome-wide association studies (GWAS, over 697,000 participants) confirm a genetic component to chronotype. But the punchy headline skips a nuance: those genetic variants mostly affect sleep TIMING (bedtime/wake time), not so much duration or quality — for the vast majority of people who aren't genetic short sleepers, the 7-9h range remains the best-established benchmark (AASM/NSF consensus, grade A). Calling 8 hours "a lie" generalizes a real but rare phenomenon to the whole population.

the sources

1. 1Watson NF et al. (AASM & Sleep Research Society) 2015
2. 2Hirshkowitz M et al. (National Sleep Foundation) 2015