☞ The illustrated encyclopedia of sleeping positions on a plane

The Washington Post 用插画描述了坐飞机时可以采取的千奇百怪（应该是包含了所有可能性）的睡觉姿势，我一般采用的就是最后的那个 The WTF 姿势：

Sit upright, without the
support of any travel gear,
and sleep peacefully like a
truly unstable person.