Inemuri

Inemuri (Japanese居眠り" to be present and to sleep " ) is the most common in Japan, public form of the nap. So it is not uncommon in Japan, " sleep " during a conference, or break in the path to. This type of sleep is so flat that it's ready yet perceives the environment to get out, for example at the right stop.

The word Inemuri is composed of i [ ru] (居[る] " be present " ) and nemuri (眠り"sleep ").