28:23
This Nidra includes a section called "Images of the day," in which you'll get guided into a practice of systemically going through what you've been through during the day. A bell (12 times) is there to "disturb" you so that you stay in a liminal state for a while: this helps the brain with structuring and digesting the impressions and memories. This may seem annoying - but it will improve sleep quality. After the 12th time, the bell goes quiet and you can drift into a peaceful and deep sleep.