Some argue that a mitigation technique—controlled rest in position (CRIP)—should be implemented, reports Forbes.
Some research suggests that CRIP is an effective fatigue countermeasure, although the evidence is admittedly sparse. One study found that pilots who took a 40-minute nap (compared to a control group who did not nap) had faster reaction times and higher subjective alertness ratings.
Naps are an effective fatigue management strategy and have been studied in a variety of occupational settings.
You just need to be sure both pil9ts are not napping at the same time. Hawaii air flying 20 minutes past Hawaii while both pilots fell asleep would be an example.