I second this statement. I did polyphasic sleep for months with a very rigorous schedule, sleeping 4.5h/day, eating well, doing exercise, coding a lot, learning lots with great retention. After the adaptation period I felt great.
Otherwise, I usually sleep 7h - 8h, and that's restful. However, I once had to endure 2 months of pain, waking up every 1h - 3h and having to walk around at night. In total, I slept 7h - 7h30 ... but felt extremely tired, I had trouble remembering words, had no energy, was confused, and found it hard to think ...
Otherwise, I usually sleep 7h - 8h, and that's restful. However, I once had to endure 2 months of pain, waking up every 1h - 3h and having to walk around at night. In total, I slept 7h - 7h30 ... but felt extremely tired, I had trouble remembering words, had no energy, was confused, and found it hard to think ...