The article understates how important pure darkness is, just a crack of light under a door can whack lab animals' melatonin levels. Also for constant biphasic s

The article understates how important pure darkness is, just a crack of light under a door can whack lab animals' melatonin levels. Also for constant biphasic sleep (which you want) 8.5 hrs isn't really enough, certainly not year 'round (I do skimp a bit during summer, near equinox.)