FAA did study in the late 80's early 90's and recommend controlled sleeping in the cockpit was the best way to combat fatigue. They studied the occurrence of micro naps, these are naps that you have no control over, and you nod off. On crews studied who did not have controlled sleeping in the cockpit there were 147 occurrences of micro nap, a number of them during the approach phase. On the crews at foreign airlines that allowed sleeping in the cockpit, there were no occurrences of micro naps during the approach phase. The FAA recommended that controlled napping in the cockpit be adopted as US policy, however Gov’t officials felt that official recognition of sleeping on the job was un-American. Sorry of a mirco-nap. When you fly shifting schedules, you have to plan sleeping otherwise it is uncontrollable. Having one guy rest his eyes for 20 minutes, when other one knows it is going on does wonders for your ability to make that tight approach at the end of the night. However when everyone in the cockpit is asleep, that is scary. We used to fly these night and day patrols around Vietnam, terrible schedule, 12 hr flights, fly a day flight 12 hours off fly a night flight, 24 hrs off fly a day flight. 10 days in a row. One night off the south end of the country, at 0300, nothing is going on, no contacts, no chatter on the intercom, I am fighting off sleep and loosing, a mirco-nap hits and I nod off. I wake up, you do not know if it has been 30 seconds or 30 minutes, we are on the autopilot' at 1,500’, #1 engine in the bag to save fuel, and all 10 of the crew is asleep. Talk about being wide-awake, Where the are we? Now how do you wake up the PPC without letting him know you nodded off also? The F/E was also in the bag. So I called for "Coffee around for my friends" The point is the worse thing about sleeping in the cockpit is letting it sneak up on you, You know it might happen, plan on when it is going to happen, control it.