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I heard about power napping some years ago, when Sir Peter Parker, then Chairman of BR, was asked how he managed to work up to 20 hours a day! He then described the technique of power napping, which was what he used to survive basically.
At the time I used to commute for 5-7 hours a day, do at least an 8-10 hour working day and was generally shot to pieces every weekend.
So, I tried to learn the secret of power napping by practicing at lunchtime, in my car, at the local park. After a few days I found it quite easy to, as Bern says, just park the car, relax and nod off. For me, the worrying part was thinking I might just sleep all afternoon but amazingly, it is possible to train the brain to act as a very effective alarm clock. It is astonishing how effective the technique is, and although not needing it on a daily basis now, I do still take a power nap, just for a quick refresh.
For those who struggle to gt a good night's sleep, maybe learning the power nap technique could provide a potential solution. Learn to short nap on demand, and then extend the time. Might be worth a shot.