I completely recommend following his advice on napping!
In my own self-exploration, I discovered that I had a 25 hour day, on average, based on my sleep patterns. If you ever have a week off and to yourself, start a list on when you sleep/wake during the week.
I did mine like this:
Woke up, noted the time. Did my day until I was tired, noted the time, went to bed.
Repeated all week and I ended up discovering that I gained an hour every day.
An other one that’s helpful is to determine the length of your sleep cycles.
I did that by setting my alarm to go off an hour, 1.5, 2 and 2.5 hours after going to bed.
When the alarm goes off, get up and start “doing life” like normal. If you feel woozy, disoriented and unable to think clearly, those times aren’t ideal. Reset the alarm and try again.
After doing this myself, I found out mine was especially average at around 2 hours, which happens to be the average in clinical tests.
This allowed me to set my alarm clock based on a multiple of my average sleep cycle.
So, when I sleep, it is usually for 2, 4, 6 or 8 hours at a time.
My personal result is that I can function better in daily life, when I follow this patterning.
(my only issue which prevents it from being consistently useful relates to my 25 hour circadian sleep rhythm, which is an hour more than the usual 24.)
Anyway… heh… peace! 
