For me, it very much depends… When I am in an Ashram, I need much less sleep and 6 hours is plenty, on an ongoing basis with light physical work (karma yoga) and plenty of sadhana (meditation, chanting, asana practice, pranayama). When I am back home at working full time (although not a very physical work), all I get in normally is 2 to 2.5 hours of yogic practice (a combination of the above) and then I need 7 to 7.5 hours. However, when I include Yoga Nidra (and I’ve only taken this up recently), I seem to need less sleep 6 to 6.5 hours. I will become certified in Yoga Nidra over the next year and will be exploring it more deeply!
Om shanti.
Arati