It might need some training, but it's possible. Especially when you are very tired from sleeping only 5-6 hours every day, it should be very possible have a ver

It might need some training, but it's possible. Especially when you are very tired from sleeping only 5-6 hours every day, it should be very possible have a very deep sleep even in a 20 minute "nap" (i.e., a real sleep loop that gets broken unhappily after 20 minutes).