I frequently evoke envy in people with my ability to nap virtually anywhere - airports, trains, arms folded across knees with head resting on arms, noisy living

I frequently evoke envy in people with my ability to nap virtually anywhere - airports, trains, arms folded across knees with head resting on arms, noisy living rooms, whatever. (I don't get sleepy at work usually, I have too much to do). My method: first, only works if sleepy, or if conscious that sleep is really necessary. Second, obviously, avoid stimulants pre-nap. Third, get in a position where your head won't flop around if when you fall asleep. Then, with eyes closed, imagine your consciousness as a sphere - sort of like the world of wakeful attention. And then mentally, push that sphere away, distancing oneself from conscious thought. Finally: wake up 20 minutes later. I have no idea if that will actually help anyone, but it works for me every time, with no gadgets, masks, whatever. I think the key is the ability to mentally distance oneself from conscious attention. If you can let the world slip away, you will fall asleep.