Nap of 20 Minutes not long enough?
In Human Performance I learned that a nap should not exceed 20 minutes duration. But what if one feels a longer nap is required, or how to start a 20 minute nap 10 minutes into the interval?
At our company have no fixed schedule that flight attendants are to adhere to, but often they feel safer checking rather often during the night. So I will tell them that we initiate the check, calling them after 18 minutes. And only if this call does not come will they call on the interphone to check. No noise in the cockpit and still a check every 20 minutes